[4.x]: Various floating point number comparison issues

[lukeholder]

What happened?

Description

Please put any information on any floating point number comparison issues in the comments below.

Related issues:

#1836

Related PRs:

#3385

Craft CMS version

4.x

Craft Commerce version

4.x

PHP version

No response

Operating system and version

No response

Database type and version

No response

Image driver and version

No response

Installed plugins and versions

[adrum]

@lukeholder On our non-Craft Commerce projects, we use https://github.com/moneyphp/money which helps abstract away most of the logic. It still takes careful consideration across the board when working with money, as usual.

[lukeholder]

@adrum Thanks, we are using Money in Commerce 5 and it's new Teller class for managing floating point number comparisons until we move to Money objects for all values. I will look to backport these changes to Commerce 4.

[adrum]

@lukeholder Have you given any more attention to this particular issue? We came across an issue in production where this caused an order to be "partially paid" when it should've been just "paid", and wasn't sure what to expect on this front.