Bug report

Current behavior

If you enter a value, say "1.23456", which would be truncated by formatNumber, onValueChange gets called with 1.23456, and the input text is set to e.g., "1.234".

The next time you focus and blur, onValueChange is called with 1.234, despite the user not having input.

Expected behavior

Up for discussion, but IMO focusing and blurring an input should not change the underlying value.

Reproducible example

https://codesandbox.io/p/sandbox/base-ui-number-input-blurring-xj5xsd

Base UI version

1.0.0-alpha.8

Which browser are you using?

Edge

Which OS are you using?

Windows

Additional context

In my personal number input component, to avoid this, I'm just roundtripping the value before calling onValueChange, so you do user input -> value -> formatted text -> value. Currently it's doing user input -> value and value -> formatted text separately.