Definitely want this functionality. I'd ultimately be happy with any of the top
operator spellings, with tradeoffs:
+ Is more obvious, especially to newcomers, consistent w. seq
| Is more accurate (None or '') --> '', consistent w. set
<< Could learn it easily and says "clobber" to me
The lossy-ness argument as a problem may slightly overstated. With the current
+ only the resulting copy might lose information. With += is it potentially
lossy on the original, where it is expected that the operation will mutate somehow.
Believe as the PEP alludes, that most folks would expect a last-wins clobber
(the most common use case), and for the folks that don't, one only has to try it
once at the REPL to figure it out.
Personally, I'm leaning towards the spelling of "|" but would much rather have
"+" than nothing.
-Mike
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