In order to simplify personal WIP limit per board configuration: it would be nice if the defaults displayed are only integers. Also - in case a value of invalid format is entered, fail fast with some kind of error indication.

Currently the default WIP Value on the board Team Member configuration is 0.0 which suggests that fractional numbers are supported. That however doesn't seem to be true - it's not possible to save a fractional number now.
When a fractional number is inserted - e.g. 0.3: initially it seems accepted (some server error message is received after 10+ seconds).

When I insert some letters instead of number (a) - then the behavior is better: an error message is displayed almost immediately.