Fixes "undefined" initial parameters when initial: 0. The problem was that 0 is falsy and so def.initial || def['default'] || def.checked would skip it. Changed to check for !== undefined.
Fix bug when loading "all parameters" demo (see jscad.app now). For a choice parameter, captions is optional.
This PR primarily fixes two bugs:
initial: 0. The problem was that0is falsy and sodef.initial || def['default'] || def.checkedwould skip it. Changed to check for!== undefined.captionsis optional.Some additional minor fixes:
formValueandfillFormfunctions