Khan/khan-exercises — comment on commit 282e4d4a4a4519c087095385870d434bedd314c9
File: utils/answer-types.js line 59
By beneater:

@spicyj This logic basically says if you enter 0.5 and the correct answer is 5, it'll try putting a comma in there that later gets ignored and the answer is marked correct.

I think that's what's causing the issue in #10100.

Seems like there should be some more complete i18n library that'll do this for us correctly, but I have no idea.