Fix float_to_str for negative values and zero-padding#119
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Use abs() before modulo to prevent Python's modulo returning incorrect positive remainders for negative floats (BUG-102). Add 3-digit zero- padding to preserve leading zeros in the fractional part (BUG-103). Use round() instead of int() to avoid floating-point truncation errors. Applied to interpretation.py, interpretation_fp.py, and interpretation_parallel.py. Added parametrized tests covering negative values, zero-padding, and combined cases across both backends. Also guard .cache_status.yaml write so test runners (pytest/unittest) no longer dirty the repo file during pre-commit hooks. Closes #93 Closes #94 Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
ColtonPayne
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kmukherji
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Feb 10, 2026
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Summary
float_to_str()producing incorrect output for negative floats due to Python's modulo behavior (-3.456 % 1 = 0.544). Usesabs()before modulo and handles the-0.xxxsign case.3.001rendered as"3.1"). Now always produces 3 decimal digits.round()instead ofint()for the decimal part to avoid floating-point truncation errors.interpretation.py,interpretation_fp.py, andinterpretation_parallel.py..cache_status.yamlwrite behind a test-runner check so pre-commit hooks no longer dirty the repo file.Test plan
test_float_to_str_negative_values— parametrized over 3 negative float casestest_float_to_str_zero_padding— parametrized over 4 leading-zero casestest_float_to_str_negative_with_zero_padding— parametrized over 2 combined casesinterpretation_fpandinterpretationbackendsCloses #93
Closes #94
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