[alanhamlett]

Fixes this traceback that I received using v3.2.2 in production:

Traceback (most recent call last):
  File "/opt/wakatime/current/wakatime/api_v1.py", line 2891, in consume_heartbeat_validate
    form = HeartbeatForm.from_json(data)
  File "/opt/wakatime/current/.venv/src/wtforms-json/wtforms_json/__init__.py", line 236, in from_json
    form = cls(
        formdata=MultiDict(
    ...<6 lines>...
        **kwargs
    )
  File "/opt/wakatime/current/.venv/lib/python3.14/site-packages/wtforms/form.py", line 209, in __call__
    return type.__call__(cls, *args, **kwargs)
           ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/wakatime/current/.venv/lib/python3.14/site-packages/wtforms/form.py", line 287, in __init__
    self.process(formdata, obj, data=data, **kwargs)
    ~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/wakatime/current/.venv/lib/python3.14/site-packages/wtforms/form.py", line 128, in process
    field.process(formdata, data, extra_filters=field_extra_filters)
    ~~~~~~~~~~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/wakatime/current/.venv/src/wtforms-json/wtforms_json/__init__.py", line 192, in process
    func(self, formdata, data=data, **kwargs)
    ~~~~^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/wakatime/current/.venv/lib/python3.14/site-packages/wtforms/fields/core.py", line 320, in process
    self.process_formdata(self.raw_data)
    ~~~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^^^^^
  File "/opt/wakatime/current/.venv/lib/python3.14/site-packages/wtforms/fields/numeric.py", line 165, in process_formdata
    self.data = decimal.Decimal(valuelist[0])
                ~~~~~~~~~~~~~~~^^^^^^^^^^^^^^
TypeError: conversion from dict to Decimal is not supported

[azmeuk]

Related to #198

The test you wrote, that is passing a dict in formdata, is not actually part of the wtforms contract. But that contract is not clearly defined either, and it is cheap enough to catch TypeErrors at the same time ValueError are caught. I added the same behavior for the other fields.