Fix implicit conversion in expressions like C ? P : null
#1716
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Fixes compilation of ternary expressions with ambiguous conversion (in C?A:B A is convertible to B while B is also convertible to A). This is normally disallowed in C#, but I specifically allowed two cases
object
which can be converted to the other type - this occurs if theobject
is nullstring
which is convertible to the other type - this occurs for our enum constant literalsshould fix part of #1694