Willi Ballenthin 7f10edcbc5 fix From Base operation producing wrong results for fractional inputs
The fractional part loop used native `+=` and `Math.pow()` with BigNumber
objects, causing string concatenation instead of arithmetic addition.
Replace with BigNumber `.plus()` and `.pow()` methods.

Closes #2240

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
2026-03-24 09:20:53 +01:00
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