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README: state the exact-only calc folding rule #213

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samoht merged 1 commit into from
Jul 29, 2026
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README: state the exact-only calc folding rule #213

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7 changes: 7 additions & 0 deletions README.md
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Expand Up @@ -63,6 +63,13 @@ transforms (deduplication, rule merging, selector grouping, empty-rule
elimination, nested-rule flattening, shorthand composition, colour
canonicalisation) and emits minified output.

`calc()` arithmetic folds only when the fold is exactly value-preserving:
`calc(100/4)` becomes `25`, while `calc(1.75/1.125)` stays as written because
14/9 has no finite decimal form. Multiplication folds unconditionally, being
closed over finite decimals; division folds only when the quotient is exact. The
same rule governs a `calc()` inside a custom-property value, whose token stream
is otherwise left opaque.

This is a parser/printer round trip, not a byte-preserving formatter: comments
are discarded during parsing, and empty rules and invalid declarations are
dropped in both pretty and minified output.
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