MultipleOf validation Bug

[noelwilsondel]

Hello,

Firstly thanks for this library it's really useful, we have noticed some unusual behaviour on version 3.2.0 validation using multipleOf constraint for example:

>>> from jsonschema import validate
>>> schema = {
...     "type" : "object",
...     "properties" : {
...         "test" : {"type" : "number", "multipleOf": 0.001},
...     },
... }
>>> # This should be valid but raises validation error
>>> validate(instance={"test" : 0.95}, schema=schema)

Some other things we noticed using the above value this passes:

>>> # This is valid
>>> validate(instance={"test" : 0.01}, schema=schema)
>>> # This is valid
>>> validate(instance={"test" : 0.1}, schema=schema)
>>> # This is invalid
>>> validate(instance={"test" : 0.95}, schema=schema)

[Julian]

Hi! Glad to hear.

Sorry you're having trouble -- this issue is just the way float division works -- have a look at some historical related issues.

If you don't want float division, use something with the precision you want, e.g. decimal.Decimal, when deserializing your JSON.

[Julian]

Hope that helps with some ideas, obviously happy to follow up.

[jwnwilson]

@Julian We're attempting the parse_float=decimal.Decimal route thanks for the suggestion