diff --unified /home/github/work/_temp/branch-compare/base/index.item-splitting.js /home/github/work/_temp/branch-compare/pr/index.item-splitting.js
--- /home/github/work/_temp/branch-compare/base/index.item-splitting.js	2026-06-05 17:38:00.197039279 +0000
+++ /home/github/work/_temp/branch-compare/pr/index.item-splitting.js	2026-06-05 17:37:42.909038800 +0000
@@ -100,7 +100,7 @@
 
 const lockedFigureColorNames=["blue","gold","green","grayH","purple","pink","red","orange"];const plotterPlotTypes=["bar","line","pic","histogram","dotplot"];
 
-const pairOfNumbers=pair(number,number);const parsePerseusGraphTypeAngle=object({type:constant("angle"),showAngles:optional(boolean),allowReflexAngles:optional(boolean),angleOffsetDeg:optional(nullable(number)),snapDegrees:optional(number),match:optional(constant("congruent")),coords:optional(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers)),startCoords:optional(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers)),pointLabels:optional(trio(string,string,string))});const parsePerseusGraphTypeCircle=object({type:constant("circle"),center:optional(pairOfNumbers),radius:optional(number),startCoords:optional(object({center:pairOfNumbers,radius:number})),pointLabels:optional(array(string))});const parsePerseusGraphTypeLinear=object({type:constant("linear"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),pointLabels:optional(pair(string,string))});const parsePerseusGraphTypeLinearSystem=object({type:constant("linear-system"),coords:optional(nullable(array(pair(pairOfNumbers,pairOfNumbers)))),startCoords:optional(array(pair(pairOfNumbers,pairOfNumbers))),pointLabels:optional(array(string))});const parsePerseusGraphTypeNone=object({type:constant("none")});const parsePerseusGraphTypePoint=object({type:constant("point"),numPoints:optional(union(number).or(constant("unlimited")).parser),coords:optional(nullable(array(pairOfNumbers))),startCoords:optional(array(pairOfNumbers)),coord:optional(pairOfNumbers),pointLabels:optional(array(string))});const parsePerseusGraphTypePolygon=object({type:constant("polygon"),numSides:optional(union(number).or(constant("unlimited")).parser),showAngles:optional(boolean),showSides:optional(boolean),snapTo:optional(enumeration("grid","angles","sides")),match:optional(enumeration("similar","congruent","approx","exact")),startCoords:optional(array(pairOfNumbers)),coords:optional(nullable(array(pairOfNumbers))),pointLabels:optional(array(string))});const parsePerseusGraphTypeQuadratic=object({type:constant("quadratic"),coords:optional(nullable(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers))),startCoords:optional(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers)),pointLabels:optional(trio(string,string,string))});const parsePerseusGraphTypeRay=object({type:constant("ray"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),pointLabels:optional(pair(string,string))});const parsePerseusGraphTypeSegment=object({type:constant("segment"),numSegments:optional(number),coords:optional(nullable(array(pair(pairOfNumbers,pairOfNumbers)))),startCoords:optional(array(pair(pairOfNumbers,pairOfNumbers))),pointLabels:optional(array(string))});const parsePerseusGraphTypeSinusoid=object({type:constant("sinusoid"),coords:optional(nullable(array(pairOfNumbers))),startCoords:optional(array(pairOfNumbers)),pointLabels:optional(array(string))});const parsePerseusGraphTypeExponential=object({type:constant("exponential"),coords:optional(nullable(array(pairOfNumbers))),asymptote:optional(nullable(number)),startCoords:optional(object({coords:pair(pairOfNumbers,pairOfNumbers),asymptote:number})),pointLabels:optional(array(string))});const parsePerseusGraphTypeAbsoluteValue=object({type:constant("absolute-value"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),pointLabels:optional(pair(string,string))});const parsePerseusGraphTypeTangent=object({type:constant("tangent"),coords:optional(nullable(array(pairOfNumbers))),startCoords:optional(array(pairOfNumbers)),pointLabels:optional(array(string))});const parsePerseusGraphTypeLogarithm=object({type:constant("logarithm"),coords:optional(nullable(array(pairOfNumbers))),asymptote:optional(nullable(number)),startCoords:optional(object({coords:pair(pairOfNumbers,pairOfNumbers),asymptote:number})),pointLabels:optional(array(string))});const parsePerseusGraphTypeVector=object({type:constant("vector"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),match:optional(enumeration("exact","congruent"))});const parsePerseusGraphType=discriminatedUnionOn("type").withBranch("absolute-value",parsePerseusGraphTypeAbsoluteValue).withBranch("angle",parsePerseusGraphTypeAngle).withBranch("circle",parsePerseusGraphTypeCircle).withBranch("exponential",parsePerseusGraphTypeExponential).withBranch("linear",parsePerseusGraphTypeLinear).withBranch("linear-system",parsePerseusGraphTypeLinearSystem).withBranch("none",parsePerseusGraphTypeNone).withBranch("point",parsePerseusGraphTypePoint).withBranch("polygon",parsePerseusGraphTypePolygon).withBranch("quadratic",parsePerseusGraphTypeQuadratic).withBranch("ray",parsePerseusGraphTypeRay).withBranch("segment",parsePerseusGraphTypeSegment).withBranch("sinusoid",parsePerseusGraphTypeSinusoid).withBranch("tangent",parsePerseusGraphTypeTangent).withBranch("logarithm",parsePerseusGraphTypeLogarithm).withBranch("vector",parsePerseusGraphTypeVector).parser;const parseLockedFigureColor=enumeration(...lockedFigureColorNames);const parseLockedFigureFillType=enumeration("none","white","translucent","solid");const parseLockedLineStyle=enumeration("solid","dashed");const parseStrokeWeight=defaulted(enumeration("medium","thin","thick"),()=>"medium");const parseLockedLabelType=object({type:constant("label"),coord:pairOfNumbers,text:string,color:parseLockedFigureColor,size:enumeration("small","medium","large")});const parseLockedPointType=object({type:constant("point"),coord:pairOfNumbers,color:parseLockedFigureColor,filled:boolean,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedLineType=object({type:constant("line"),kind:enumeration("line","ray","segment"),points:pair(parseLockedPointType,parseLockedPointType),color:parseLockedFigureColor,lineStyle:parseLockedLineStyle,showPoint1:defaulted(boolean,()=>false),showPoint2:defaulted(boolean,()=>false),weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedVectorType=object({type:constant("vector"),points:pair(pairOfNumbers,pairOfNumbers),color:parseLockedFigureColor,weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedEllipseType=object({type:constant("ellipse"),center:pairOfNumbers,radius:pairOfNumbers,angle:number,color:parseLockedFigureColor,fillStyle:parseLockedFigureFillType,strokeStyle:parseLockedLineStyle,weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedPolygonPointType=object({coord:pairOfNumbers});const parseLockedPolygonPointsType=union(array(parseLockedPolygonPointType)).or(pipeParsers(array(pairOfNumbers)).then(convert(coords=>coords.map(coord=>({coord})))).parser).parser;const parseLockedPolygonType=object({type:constant("polygon"),points:parseLockedPolygonPointsType,color:parseLockedFigureColor,showVertices:boolean,fillStyle:parseLockedFigureFillType,strokeStyle:parseLockedLineStyle,weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const numberOrNegativeInfinity=union(number).or(constant(-Infinity)).parser;const numberOrPositiveInfinity=union(number).or(constant(Infinity)).parser;const parseLockedFunctionDomain=defaulted(pair(defaulted(numberOrNegativeInfinity,()=>-Infinity),defaulted(numberOrPositiveInfinity,()=>Infinity)),()=>[-Infinity,Infinity]);const parseLockedFunctionType=object({type:constant("function"),color:parseLockedFigureColor,strokeStyle:parseLockedLineStyle,weight:parseStrokeWeight,equation:string,directionalAxis:enumeration("x","y"),domain:parseLockedFunctionDomain,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedFigure=discriminatedUnionOn("type").withBranch("point",parseLockedPointType).withBranch("line",parseLockedLineType).withBranch("vector",parseLockedVectorType).withBranch("ellipse",parseLockedEllipseType).withBranch("polygon",parseLockedPolygonType).withBranch("function",parseLockedFunctionType).withBranch("label",parseLockedLabelType).parser;const parseLabelLocation=union(enumeration("onAxis","alongEdge")).or(pipeParsers(constant("")).then(convert(()=>"onAxis")).parser).parser;const parseInteractiveGraphWidget=parseWidget(constant("interactive-graph"),object({step:pairOfNumbers,gridStep:optional(pairOfNumbers),snapStep:optional(pairOfNumbers),backgroundImage:optional(parsePerseusImageBackground),markings:enumeration("graph","grid","none","axes"),labels:optional(array(string)),labelLocation:optional(parseLabelLocation),showProtractor:boolean,showRuler:optional(boolean),showTooltips:optional(boolean),rulerLabel:optional(string),rulerTicks:optional(number),range:pair(pairOfNumbers,pairOfNumbers),showAxisArrows:defaulted(object({xMin:boolean,xMax:boolean,yMin:boolean,yMax:boolean}),()=>({xMin:true,xMax:true,yMin:true,yMax:true})),showAxisTicks:defaulted(object({x:boolean,y:boolean}),()=>({x:true,y:true})),graph:defaulted(parsePerseusGraphType,()=>({type:"linear"})),correct:defaulted(parsePerseusGraphType,()=>({type:"linear"})),lockedFigures:defaulted(array(parseLockedFigure),()=>[]),fullGraphAriaLabel:optional(string),fullGraphAriaDescription:optional(string)}));
+const pairOfNumbers=pair(number,number);const parsePerseusGraphTypeAngle=object({type:constant("angle"),showAngles:optional(boolean),allowReflexAngles:optional(boolean),angleOffsetDeg:optional(nullable(number)),snapDegrees:optional(number),match:optional(constant("congruent")),coords:optional(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers)),startCoords:optional(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers)),pointLabels:optional(trio(string,string,string))});const parsePerseusGraphTypeCircle=object({type:constant("circle"),center:optional(pairOfNumbers),radius:optional(number),startCoords:optional(object({center:pairOfNumbers,radius:number})),pointLabels:optional(array(string))});const parsePerseusGraphTypeLinear=object({type:constant("linear"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),pointLabels:optional(pair(string,string))});const parsePerseusGraphTypeLinearSystem=object({type:constant("linear-system"),coords:optional(nullable(array(pair(pairOfNumbers,pairOfNumbers)))),startCoords:optional(array(pair(pairOfNumbers,pairOfNumbers))),pointLabels:optional(array(string))});const parsePerseusGraphTypeNone=object({type:constant("none")});const parsePerseusGraphTypePoint=object({type:constant("point"),numPoints:optional(union(number).or(constant("unlimited")).parser),coords:optional(nullable(array(pairOfNumbers))),startCoords:optional(array(pairOfNumbers)),coord:optional(pairOfNumbers),pointLabels:optional(array(string))});const parsePerseusGraphTypePolygon=object({type:constant("polygon"),numSides:optional(union(number).or(constant("unlimited")).parser),showAngles:optional(boolean),showSides:optional(boolean),snapTo:optional(enumeration("grid","angles","sides")),match:optional(enumeration("similar","congruent","approx","exact")),startCoords:optional(array(pairOfNumbers)),coords:optional(nullable(array(pairOfNumbers))),pointLabels:optional(array(string))});const parsePerseusGraphTypeQuadratic=object({type:constant("quadratic"),coords:optional(nullable(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers))),startCoords:optional(trio(pairOfNumbers,pairOfNumbers,pairOfNumbers)),pointLabels:optional(trio(string,string,string))});const parsePerseusGraphTypeRay=object({type:constant("ray"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),pointLabels:optional(pair(string,string))});const parsePerseusGraphTypeSegment=object({type:constant("segment"),numSegments:optional(number),coords:optional(nullable(array(pair(pairOfNumbers,pairOfNumbers)))),startCoords:optional(array(pair(pairOfNumbers,pairOfNumbers))),pointLabels:optional(array(string))});const parsePerseusGraphTypeSinusoid=object({type:constant("sinusoid"),coords:optional(nullable(array(pairOfNumbers))),startCoords:optional(array(pairOfNumbers)),pointLabels:optional(array(string))});const parsePerseusGraphTypeExponential=object({type:constant("exponential"),coords:optional(nullable(array(pairOfNumbers))),asymptote:optional(nullable(number)),startCoords:optional(object({coords:pair(pairOfNumbers,pairOfNumbers),asymptote:number})),pointLabels:optional(array(string))});const parsePerseusGraphTypeAbsoluteValue=object({type:constant("absolute-value"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),pointLabels:optional(pair(string,string))});const parsePerseusGraphTypeTangent=object({type:constant("tangent"),coords:optional(nullable(array(pairOfNumbers))),startCoords:optional(array(pairOfNumbers)),pointLabels:optional(array(string))});const parsePerseusGraphTypeLogarithm=object({type:constant("logarithm"),coords:optional(nullable(array(pairOfNumbers))),asymptote:optional(nullable(number)),startCoords:optional(object({coords:pair(pairOfNumbers,pairOfNumbers),asymptote:number})),pointLabels:optional(array(string))});const parsePerseusGraphTypeVector=object({type:constant("vector"),coords:optional(nullable(pair(pairOfNumbers,pairOfNumbers))),startCoords:optional(pair(pairOfNumbers,pairOfNumbers)),match:optional(enumeration("exact","congruent"))});const parsePerseusGraphType=discriminatedUnionOn("type").withBranch("absolute-value",parsePerseusGraphTypeAbsoluteValue).withBranch("angle",parsePerseusGraphTypeAngle).withBranch("circle",parsePerseusGraphTypeCircle).withBranch("exponential",parsePerseusGraphTypeExponential).withBranch("linear",parsePerseusGraphTypeLinear).withBranch("linear-system",parsePerseusGraphTypeLinearSystem).withBranch("none",parsePerseusGraphTypeNone).withBranch("point",parsePerseusGraphTypePoint).withBranch("polygon",parsePerseusGraphTypePolygon).withBranch("quadratic",parsePerseusGraphTypeQuadratic).withBranch("ray",parsePerseusGraphTypeRay).withBranch("segment",parsePerseusGraphTypeSegment).withBranch("sinusoid",parsePerseusGraphTypeSinusoid).withBranch("tangent",parsePerseusGraphTypeTangent).withBranch("logarithm",parsePerseusGraphTypeLogarithm).withBranch("vector",parsePerseusGraphTypeVector).parser;const parseLockedFigureColor=enumeration(...lockedFigureColorNames);const parseLockedFigureFillType=enumeration("none","white","translucent","solid");const parseLockedLineStyle=enumeration("solid","dashed");const parseStrokeWeight=defaulted(enumeration("medium","thin","thick"),()=>"medium");const parseLockedLabelType=object({type:constant("label"),coord:pairOfNumbers,text:string,color:parseLockedFigureColor,size:enumeration("small","medium","large")});const parseLockedPointType=object({type:constant("point"),coord:pairOfNumbers,color:parseLockedFigureColor,filled:boolean,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedLineType=object({type:constant("line"),kind:enumeration("line","ray","segment"),points:pair(parseLockedPointType,parseLockedPointType),color:parseLockedFigureColor,lineStyle:parseLockedLineStyle,showPoint1:defaulted(boolean,()=>false),showPoint2:defaulted(boolean,()=>false),weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedVectorType=object({type:constant("vector"),points:pair(pairOfNumbers,pairOfNumbers),color:parseLockedFigureColor,weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedEllipseType=object({type:constant("ellipse"),center:pairOfNumbers,radius:pairOfNumbers,angle:number,color:parseLockedFigureColor,fillStyle:parseLockedFigureFillType,strokeStyle:parseLockedLineStyle,weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedPolygonPointType=object({coord:pairOfNumbers,showAngle:defaulted(boolean,()=>false)});const parseLockedPolygonPointsType=union(array(parseLockedPolygonPointType)).or(pipeParsers(array(pairOfNumbers)).then(convert(coords=>coords.map(coord=>({coord,showAngle:false})))).parser).parser;const parseLockedPolygonType=object({type:constant("polygon"),points:parseLockedPolygonPointsType,color:parseLockedFigureColor,showVertices:boolean,fillStyle:parseLockedFigureFillType,strokeStyle:parseLockedLineStyle,weight:parseStrokeWeight,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const numberOrNegativeInfinity=union(number).or(constant(-Infinity)).parser;const numberOrPositiveInfinity=union(number).or(constant(Infinity)).parser;const parseLockedFunctionDomain=defaulted(pair(defaulted(numberOrNegativeInfinity,()=>-Infinity),defaulted(numberOrPositiveInfinity,()=>Infinity)),()=>[-Infinity,Infinity]);const parseLockedFunctionType=object({type:constant("function"),color:parseLockedFigureColor,strokeStyle:parseLockedLineStyle,weight:parseStrokeWeight,equation:string,directionalAxis:enumeration("x","y"),domain:parseLockedFunctionDomain,labels:defaulted(array(parseLockedLabelType),()=>[]),ariaLabel:optional(string)});const parseLockedFigure=discriminatedUnionOn("type").withBranch("point",parseLockedPointType).withBranch("line",parseLockedLineType).withBranch("vector",parseLockedVectorType).withBranch("ellipse",parseLockedEllipseType).withBranch("polygon",parseLockedPolygonType).withBranch("function",parseLockedFunctionType).withBranch("label",parseLockedLabelType).parser;const parseLabelLocation=union(enumeration("onAxis","alongEdge")).or(pipeParsers(constant("")).then(convert(()=>"onAxis")).parser).parser;const parseInteractiveGraphWidget=parseWidget(constant("interactive-graph"),object({step:pairOfNumbers,gridStep:optional(pairOfNumbers),snapStep:optional(pairOfNumbers),backgroundImage:optional(parsePerseusImageBackground),markings:enumeration("graph","grid","none","axes"),labels:optional(array(string)),labelLocation:optional(parseLabelLocation),showProtractor:boolean,showRuler:optional(boolean),showTooltips:optional(boolean),rulerLabel:optional(string),rulerTicks:optional(number),range:pair(pairOfNumbers,pairOfNumbers),showAxisArrows:defaulted(object({xMin:boolean,xMax:boolean,yMin:boolean,yMax:boolean}),()=>({xMin:true,xMax:true,yMin:true,yMax:true})),showAxisTicks:defaulted(object({x:boolean,y:boolean}),()=>({x:true,y:true})),graph:defaulted(parsePerseusGraphType,()=>({type:"linear"})),correct:defaulted(parsePerseusGraphType,()=>({type:"linear"})),lockedFigures:defaulted(array(parseLockedFigure),()=>[]),fullGraphAriaLabel:optional(string),fullGraphAriaDescription:optional(string)}));
 
 const parseLabelImageWidget=parseWidget(constant("label-image"),object({choices:array(string),imageUrl:string,imageAlt:string,imageHeight:number,imageWidth:number,markers:array(object({answers:defaulted(array(string),()=>[]),label:string,x:number,y:number})),hideChoicesFromInstructions:boolean,multipleAnswers:boolean,static:defaulted(boolean,()=>false)}));