TestHomeSpellingsStayLinear's parent-segments shape cannot see the lexical fold: cleanSeparators, foldParents and literalSegment tally no work, so a fold that copies its stack per pop (quadratic) passes the pin whose name says it holds the spelling linear.

TestHomeSpellingsStayLinear's parent-segments shape cannot see the lexical fold: cleanSeparators, foldParents and literalSegment tally no work, so a fold that copies its stack per pop (quadratic) passes the pin whose name says it holds the spelling linear.

Grounds

• pursued: a quadratic fold fails the pin; a quadratic mutation of the fold that the pin passes would show it wrong