Fix is_str unused variable under Free-Threading builds

During build I noticed this warning:

  src/msgspec/_core.c: In function ‘json_decode_dict_key’:
  src/msgspec/_core.c:17942:10: warning: unused variable ‘is_str’ [-Wunused-variable]
  17942 |     bool is_str = type->types == MS_TYPE_ANY || type->types == MS_TYPE_STR;
        |          ^~~~~~

Link: https://github.com/msgspec/msgspec/actions/runs/31476259980/job/93742042390

I removed both the release and the tag, so we can fix the CI.

Fix unused variable in `json_decode_dict_key` under FT builds (msgspe…

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Fix `is_str` unused variable under Free-Threading builds #1144

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Fix is_str unused variable under Free-Threading builds #1144

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sobolevn commented on Aug 11, 2026

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Fix `is_str` unused variable under Free-Threading builds #1144