Optimize JSON encoding of numbers - #458

import random
from time import perf_counter_ns

from orjson import dumps
from msgspec.json import encode

N = 10000
M = 2000
random.seed(42)
for header, scale, func in [
    ("Small Integers:", 1000, random.randint),
    ("Large Integers:", int(1e16), random.randint),
    ("Small Floats:", 1000, random.uniform),
    ("Large Floats:", int(1e16), random.uniform),
]:
    print(header)
    data = [func(-scale, scale) for _ in range(N)]

    start = perf_counter_ns()
    for _ in range(M):
        encode(data)
    stop = perf_counter_ns()
    print(f"- msgspec: {(stop - start) / (1000 * M):.2f} us")

    start = perf_counter_ns()
    for _ in range(M):
        dumps(data)
    stop = perf_counter_ns()
    print(f"- orjson: {(stop - start) / (1000 * M):.2f} us")