DecimalField validation turns '0' into empty string

[MattFisher]

The line value = value.replace(/^0+/, '') at https://github.com/insin/newforms/blob/react/lib/fields.js#L440 within DecimalField.prototype.clean turns the string "0" into "", which is later returned for storage in cleaned_data.

It is also fed into this.runValidators(parseFloat(value)) at https://github.com/insin/newforms/blob/react/lib/fields.js#L482, and I haven't checked whether it will validate if max and min values have been set.

A simple but slightly hacky solution would be:

if (value !== '0') {
    value = value.replace(/^0+/, '')
}

[insin]

Thanks for the bug report, a proper native decimal type can't come too soon 😁