fix: rounding

[qualiaenjoyer]

Overview

I noticed I was placing an order with size 9.53 and I was getting back one with size 9.52.
Turns out it was due to round_down(9.53, 2) = 9.52 in order_builder/helpers.

Description

• Changed round_up and round_down from floor/ceil to Decimal.quantize to eliminate binary float errors and ensure the expected base-10 behavior (e.g. round_down(9.53, 2) = 9.53).
• Changed round_normal and to_token_decimals for style consistency with the above changes.

Types of changes

• Bug fix/behavior correction

Status

• Prefix PR title with [WIP] if necessary (changes not yet made).
• Add tests to cover changes as needed. (NA)
• Update documentation/changelog as needed. (NA)
• Verify all tests run correctly in CI and pass. - all 82 tests pass
• Ready for review/merge.

same "Found 108 errors in 10 files (checked 21 source files)" linting errors as py-clob-client 0.25.0.

---

Note

Replace float-based rounding with Decimal.quantize for base-10 precision and simplify to_token_decimals.

• Rounding behavior (py_clob_client/order_builder/helpers.py):
  • round_down, round_normal, round_up now use Decimal.quantize with ROUND_FLOOR, ROUND_HALF_UP, and ROUND_CEILING to ensure base-10 precision.
  • to_token_decimals rewritten to use Decimal.quantize after scaling by 10**6, removing intermediate float checks.

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[qualiaenjoyer]

@JonathanAmenechi any chance for a review? it can cause a bunch of problems in automated trading systems.