Use PyInt for inequality and multiple of checks

[samuelcolvin]

This degrades performance in the case of inequality checks by around 30%, but if prevents issues with ints over i64::MAX.

Selected Reviewer: @dmontagu

[codspeed-hq]

CodSpeed Performance Report

Merging #634 use-PyInt (89c310e) will not alter performances.

Summary

🔥 0 improvements
❌ 0 regressions
✅ 121 untouched benchmarks

🆕 2 new benchmarks
⁉️ 0 dropped benchmarks

Benchmarks breakdown

	Benchmark	main	use-PyInt	Change
🆕	test_int_range	N/A	18.5 µs	N/A
🆕	test_int_range_json	N/A	19.7 µs	N/A

[codecov-commenter]

Codecov Report

Merging #634 (4d8f3c4) into main (6220455) will decrease coverage by 0.12%.
The diff coverage is 87.30%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main     #634      +/-   ##
==========================================
- Coverage   94.10%   93.98%   -0.12%     
==========================================
  Files          99       99              
  Lines       13561    13591      +30     
  Branches       25       25              
==========================================
+ Hits        12762    12774      +12     
- Misses        793      811      +18     
  Partials        6        6              

Impacted Files	Coverage Δ
src/validators/union.rs	86.47% <ø> (ø)
src/input/input_json.rs	90.11% <57.14%> (-1.05%)	⬇️
src/input/return_enums.rs	88.42% <57.14%> (-0.53%)	⬇️
src/input/parse_json.rs	99.20% <80.00%> (-0.80%)	⬇️
src/input/shared.rs	96.42% <92.30%> (-3.58%)	⬇️
src/input/input_python.rs	98.36% <100.00%> (ø)
src/validators/int.rs	100.00% <100.00%> (ø)
src/validators/literal.rs	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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[samuelcolvin]

please review.

[dmontagu]

Would really prefer if bigints were just handled more transparently, but this looks fine to me if it's improving other issues.

[adriangb]

Looks good overall

[samuelcolvin]

Ask and thou shall receive - added BigInt support, supports parsing ints ups to 4300 characters - matching the constraints recently added in python.

I've also used BigInt for inequality checks and thereby improved the performance on that.

├────────────────────┼─────────────────────────────────────┼────────────────────┼───────────────────┼───────────┤
│  int_range         │  int_range                          │             122.0  │            107.2  │  -12.14%  │
│                    │  int_range_json                     │             158.4  │            116.1  │  -26.66%  │
└────────────────────┴─────────────────────────────────────┴────────────────────┴───────────────────┴───────────┘