Json validation with "multipleOf": 0.1 fails when it shouldn't

[dimpon]

Describe the bug

json validation "multipleOf": 0.1 doesn't work with some values.

Expected behavior

with constraint "multipleOf": 0.1 value 100.1 must be considered as valid.

Steps to reproduce the issue

1. run the project https://github.com/dimpon/jsonforms-angular-seed
2. enter 100.1 - validation is failed
3. enter 45.5, 41.1 - all is fine

Screenshots

In which browser are you experiencing the issue?

Google Chrome Version 98.0.4758.102 (Official Build) (64-bit)

Framework

Angular

RendererSet

Material

Additional context

No response

[eneufeld]

Thank you for the report and the great reproducer.
I tracked the error down to ajv, there is even a discussion about it:
ajv-validator/ajv#84 and ajv-validator/ajv#652

So the recommendation is to either use an additional option:
https://github.com/ajv-validator/ajv/blob/master/docs/options.md#multipleofprecision
or a regex pattern: ajv-validator/ajv#84 (comment)

Does this help?

[sdirix]

This was also already reported before: #1880.

I'll add a task for the website to add this to the FAQ.

[sdirix]

I'll close this for now as no change to JSON Forms is needed. Feel free to reopen if you disagree.