Re: u+ fails to force scalar context to empty list assignment: +( () = ... )

From perlop

       Unary "+" has no effect whatsoever, even on strings.  It is use
+ful
       syntactically for separating a function name from a parenthesiz
+ed
       expression that would otherwise be interpreted as the complete 
+list of
       function arguments.  (See examples above under "Terms and List
       Operators (Leftward)".)
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