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5eb96d40ee
1. A trailing `$` at the end of a replacement string could read out of
bounds via `how[i + 1]`; this now raises `ValueError` instead.
2. Numeric capture parsing used `id += (id * 10) + digit` instead of `id
= (id * 10) + digit`, so multi-digit refs were parsed incorrectly (e.g.
`$12` resolved as capture 13 instead of 12).
4. Unterminated named replacement syntax (e.g. `${foo)` is now rejected
with ValueError instead of being accepted and parsed inconsistently.
Found and fixed by GPT 5.3 Codex.
(cherry picked from commit 9b2b286baf)