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Move the meet and the filters to a page of the language - #249

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issue-66-operands
Oct 10, 2026
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tophcodes merged 2 commits into
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issue-66-operands

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Refs #66.

Moves §4.3, the meet, and §4.8, the filters, of SPECIFICATION.md into a page of the language, BELOCH-OPERANDS.md, and deletes them there. The page states how a statement names a point, a line and a flap: the meet, the join --[…], the filters &, \ and […] with their constraints, and the flap operand #[…], each with its errors as the kernel reports them and a program the build evaluates. The overview and the grammar page point at it, and the error catalog gains the rows for filters and joins.

The page shows the filters in reads only. The kernel refuses every fold along a filtered piece of a bent crease with the crease is bent under the moving flaps, since its check walks every segment of the crease and not the selected ones; that is a kernel issue of its own.

SPECIFICATION.md §4.6 no longer calls a between extent that dangles mid-face at both ends an error: the kernel records it as one mark.

The tree-sitter grammar read a parenthesized operand outside an item, (--h & .m) * --ac, as the start of an item and produced an error node. It now has a rule for such a group.

@tophcodes tophcodes added the kind:docs Pages, figures, reference text label Oct 10, 2026
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tophcodes merged commit ce350a2 into main Oct 10, 2026
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tophcodes deleted the issue-66-operands branch October 10, 2026 19:25
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