pn.Param widgets parameters change the widget type of numbers

[xavArtley]

If we use pn.Param to a param.Number without bounds the default widget is the spinner.
However setting some params (even an empty dict) for the Number parameters in pn.Param switch the widget from Spinner to Slider

class MRE(param.Parameterized):
    number = param.Number()
pn.Column(
    pn.Param(MRE(), parameters=['number'], show_name=False),
    pn.Param(MRE(), parameters=['number'], widgets={'number':{}}, show_name=False)
)