Make creation function argument optional for variants of type {} #31
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Resolves #30 (reimplementation of #15 using conditional types).
Unlike in that proposal, this doesn't work for
void
,null
, or any other type than{}
. The reason for this is that{}
is the only unit type which works for both "merged"/"multi-valued" and "separate"/"single-valued" kinds of unions. It doesn't seem feasible in a simple way to allow more than one unit type to trigger this behavior.