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Chris Tate
43ff8a1122
- A function whose whole body is `return [a, b]` or `return { a, b }`,
with number, boolean or string fields, is now inlined where its result
is only destructured (`const [head, tail] = split(text, at)`). The
parameters are declared from the arguments, then each field straight
into its destructured binding, in the literal's order; an unread field
still evaluates into a binding of its own. No record is built, and a
slice field read only through its length or char codes becomes a
scalar slice that copies nothing. Arguments may own their value, but
as for numeric records nothing inside an argument may hold a
temporary of its own.
- A scalar slice of a proven-ASCII string computes its range inline:
the bounds clamp over the byte length exactly as scr_str_slice_range
does, and no boundary can split a surrogate pair. Other strings keep
the runtime call, which gains the same ASCII fast path.
- value-records' tuples section, `[head, tail] = split(...)` read only
through lengths, goes from two heap slices per step to none.