|> I think Perl's the only language which doesn't enforce parens if a function is pre-declared
Ruby never does, but probably you wanted to say "if and only if" ?
The possibility to omit parenthesis is essential for many syntactic sugar and DSL approaches.
Compare "has" in Moose which looks like a keyword.
has 'first_name' => (
is => 'rw',
isa => 'Str',
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