Material UI TextWidget does not set the step attribute on the input element.

[atrakh]

Prerequisites

• I have read the documentation;
• In the case of a bug report, I understand that providing a SSCCE example is tremendously useful to the maintainers.
• Ideally, I'm providing a sample JSFiddle or a shared playground link demonstrating the issue.

Description

The Material UI theme's TextWidget does not set the step attribute on the input element. This causes a bug in safari where floats are not valid inputs.

Steps to Reproduce

1. Visit this playground
2. Inspect the Number input element

Expected behavior

I would expect this behavior to be consistent with the unthemed TextField element, setting step="any"

Actual behavior

The step attribute is not set.

Version

2.5.1

[heath-freenome]

Fixed in v5 beta