When use non-frozen string for hash key with `rb_hash_aset()`, it will duplicate and freeze it internally.
To avoid duplicate and freeze, this patch will give a frozen string in `rb_hash_aset()`.
```
Warming up --------------------------------------
json 14.000 i/100ms
Calculating -------------------------------------
json 148.844 (± 1.3%) i/s - 756.000 in 5.079969s
```
```
Warming up --------------------------------------
json 16.000 i/100ms
Calculating -------------------------------------
json 165.608 (± 1.8%) i/s - 832.000 in 5.025367s
```
```
require 'json'
require 'securerandom'
require 'benchmark/ips'
obj = []
1000.times do |i|
obj << {
"id": i,
"uuid": SecureRandom.uuid,
"created_at": Time.now
}
end
json = obj.to_json
Benchmark.ips do |x|
x.report "json" do |iter|
count = 0
while count < iter
JSON.parse(json)
count += 1
end
end
end
```
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