metric() adds a digit when a value rounds into quetta #423

What did you do?

import humanize
print(humanize.metric(9.996e30))
print(humanize.metric(9.996e31))
print(humanize.metric(9.996e32))
print(humanize.metric(9999))

What did you expect to happen?

Three digits, same as 9999, which is already 10.0 k and not 10.00 k.

10.0 Q
100 Q
1.00 x 10³³
10.0 k

9.996e32 has no prefix after quetta, so scientific notation.

What actually happened?

10.00 Q
100.0 Q
1000 Q
10.0 k

The rounding carry stops at exponent 30. 2.596e32 is still 260 QF.

What versions are you using?

• OS: macOS
• Python: 3.14
• Humanize: main