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Fix significant figures when metric rounding carries within quetta #406

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Fix significant figures when metric rounding carries within quetta #406

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2 changes: 1 addition & 1 deletion src/humanize/number.py
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Original file line number Diff line number Diff line change
Expand Up @@ -582,7 +582,7 @@ def metric(value: float, unit: str = "", precision: int = 3) -> str:
value /= 10**old_bucket
digits = int(max(0, precision - exponent % 3 - 1))
# Absorb a rounding carry (9.999 -> 10.0) by bumping the exponent.
if exponent < 30 and round(abs(value), digits) >= 10 ** (exponent % 3 + 1):
if exponent < 32 and round(abs(value), digits) >= 10 ** (exponent % 3 + 1):
exponent += 1
new_bucket = exponent // 3 * 3
value /= 10 ** (new_bucket - old_bucket)
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4 changes: 4 additions & 0 deletions tests/test_number.py
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Expand Up @@ -332,6 +332,10 @@ def test_clamp(test_args: list[typing.Any], expected: str) -> None:
([1.235e29, "A"], "124 RA"),
([2.56e-30, "V"], "2.56 qV"),
([2.596e32, "F"], "260 QF"),
([9.999e30, "W"], "10.0 QW"),
([-9.999e30, "W"], "-10.0 QW"),
([9.999e31, "W"], "100 QW"),
([9.999e32, "W"], "1000 QW"),
([1e50], "1.00 x 10⁵⁰"),
([1e-50], "1.00 x 10⁻⁵⁰"),
([-1500, "V"], "-1.50 kV"),
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