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[css-values-4] Incorrect resolved type of math functions representing <number> #7486
Description
In CSS Values 4, 10.9. Type Checking:
Math functions themselves have types, according to their contained calculations:
- […]
- The type of a
sign()expression is«[ "number" → 1 ]».- The type of a
sin(),cos(), ortan()expression is«[ "number" → 1 ]».- […]
- The type of a
pow(),sqrt(),log(), orexp()expression is«[ "number" → 1 ]».[…]
A math function resolves to
<number>,<length>,<angle>,<time>,<frequency>,<resolution>,<flex>, or<percentage>according to which of those productions its type matches.
I do not understand the type defined for these functions. I expect «[ ]» because from CSS Typed OM:
A type matches
<number>if it has no non-zero entries and its percent hint is null.