NumberField has NaN value

[Haberkamp]

Describe the bug
Pressing the Backspace when the number input has a negative value the content of the number field will be NaN.

To Reproduce
Steps to reproduce the behavior:

1. Enter -1 in the number input
2. Press Backspace key.
3. NaN will be shown inside the number input

Expected behavior
The content of the input should be -

This bug occours on every browser and end device.
Tested on version 0.6.6.

[zxh326]

any updates？

[adamghowiba]

Any updated on this? Have had to create some painful work around.