This value should either be pinned, or looked up when needed at runtime.
Without pinning, the GC may move the encoding object, and that could
cause a crash.
In this case it is easier to find the value at runtime, and there is no
performance penalty (as Ruby caches encoding indexes). We can shorten
the code, be compaction friendly, and incur no performance penalty.
Stop BigDecimal-specific optimization. Instead, it tries the conversion
methods in the following order:
1. `try_convert`,
2. `new`, and
3. class-named function, e.g. `Foo::Bar.Baz` function for `Foo::Bar::Baz` class
If all the above candidates are unavailable, it fallbacks to Float.
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
```
18292c0c1d
Ragel generates a code `0 <= (*p)` where `*p` is char.
As char is unsigned by default on arm and RISC-V, it is warned by gcc:
```
compiling parser.c
parser.c: In function ‘JSON_parse_string’:
parser.c:1566:2: warning: comparison is always true due to limited range of data type [-Wtype-limits]
if ( 0 <= (*p) && (*p) <= 31 )
^
parser.c:1596:2: warning: comparison is always true due to limited range of data type [-Wtype-limits]
if ( 0 <= (*p) && (*p) <= 31 )
^
```
This change removes the warning by substituting the condition with
`0 <= (signed char)(*p)`.
