Pending multi-byte context for the byte-at-a-time decoder (see `decodeUTF8`).
`Ready` is a codepoint boundary; the others hold the lead byte and the
continuation bytes collected so far while more are awaited. `ThreeA`/`FourA`
also carry the lead's byte offset, the only states whose error (overlong /
surrogate / out-of-range) is reported AT the lead rather than at the byte
being read.
155constructor UTF8PendingThreeBThe compiler supplied declaration spans and resolved links from this source snapshot. This page does not assert that this file belongs to a checked closure.