Everything is a message
(Except for syntax)
You cannot overload a message except with a message of the same kind (Unary, binary, keyword)
A message is the selector plus arguments (if there are arguments)
It is sent to a receiver
i.e. whatever is 'self' for the message
Binary messages only ever contain these characters:
+, −,
*
, /, &, =, >, |, <, ∼, and @
Precedence is always unary, then binary then keyword
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