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Functions in mathematics sets a good precedent for lack of a return keyword.

Where did you see that it says you can do it in the middle of a function? I understood it implicitly returns the last expression.

As far as a precedent, lisp does it that way, and it may be older than the existence of the return statement. Any language that lacks statements usually does it this way.

Lisp, Dylan, Smalltalk, ML, Haskell, CoffeeScript, and Dart all have various levels of implicit return. It makes sense in a language where there are no statements, just expressions.

Generally code is written to not need to return from the middle of a function. This is only really inconvenient in loops, and at least Dylan, Lisp, and Smalltalk make some provision for an "early return."

Someone said Dylan so I just respond...my favorite language of all times :)