Commits on Jun 15, 2020

1. Improve inference for unique with abstract eltypes …

   #20317 improved inference of unique, but problematic cases still arise
   for containers with known but abstract eltypes. Here, we short-circuit
   the `typejoin` when the return type is determined by the element type
   of the input container.
   
   For `unique(f, itr)`, this commit also allows the caller to supply
   `seen::Set` to circumvent the inference challenges.

   

   timholy committed Jun 15, 2020
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