Return val unless val is a number in which case we convert to boolean.
This is useful when a boolean value is stored as a 0/1 (e.g. in JSON) and
we still want to maintain string values. null and undefined are returned as
is. E.g. checkbox may be boolean or 'radio'.
Return
valunlessvalis a number in which case we convert to boolean. This is useful when a boolean value is stored as a 0/1 (e.g. in JSON) and we still want to maintain string values. null and undefined are returned as is. E.g.checkboxmay be boolean or 'radio'.