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When use non-frozen string as hash key with rb_hash_aset(), it will duplicate and freeze the string internally.
Refer: https://github.com/ruby/ruby/blob/bda56a03a625793cb3fd110458c3f7323d73705e/hash.c#L2890-L2897
To avoid duplicate and freeze, this patch will give a frozen string in rb_hash_aset().
FYI)
If you use string as hash key, hash object always might have frozen string as key.
This patch has same approch with flori/json#345
Environment
Before
After
Test code