decoder2: decode bool and numbers

[enghitalo]

feature example

json.decode[int]('1234567890')!

benchmark

Starting benchmark...
max_iterations: 1000000

***Structure and maps***
 SPENT   331.243 ms in old_json.decode(Stru, json_data)!

 SPENT   121.179 ms in decoder2.decode[StructType[string]](json_data1)!
 SPENT    85.539 ms in old_json.decode(StructType[string], json_data1)!

 SPENT   133.756 ms in decoder2.decode[StructTypeOption[string]](json_data1)!
 SPENT    83.031 ms in old_json.decode(StructTypeOption[string], json_data1)!

 SPENT   119.793 ms in decoder2.decode[StructType[int]](json_data2)!
 SPENT    84.340 ms in old_json.decode(StructType[int], json_data2)!

 SPENT   115.752 ms in decoder2.decode[map[string]string](json_data1)!
 SPENT   195.674 ms in old_json.decode(map[string]string, json_data1)!


***simple types***
 SPENT    24.796 ms in decoder2.decode[int]('2')!
 SPENT    25.352 ms in decoder2.decode[bool]('true')!

[JalonSolov]

May want to make this i8, i16, i32, i64 since int is supposed to change in the future... it will be 32 bits on 32 bit systems, and 64 bits on 64 bit systems.

[enghitalo]

Good find. I will change it in next PR to avoid rerun CI

[JalonSolov]

Heh. CI is less that halfway done.