To reproduce:
- Visit either https://en.wikipedia.org/wiki/Wikipedia?banner=B2021_0715_enWW_dsk_p1_lg_template&country=GB (banner) or http://donate.wikimedia.org/?country=GB (donatewiki)
- Enter 1.22 as amount
- Select pay the fee (£0.35)
Expected result:
- Amount passed to paymentswiki is £1.57
Actual result:
- In the URL amount=1.5699999999999998
This shouldn't affect the donor experience, because paymentswiki does round it off to £1.57. But it would be good to fix this rounding error.