> When you call a method with "keyword arguments" you are really just passing in a single hash.

Keyword arguments aren't hashes.

def my_meth(foo:, bar:)
  foo + bar
end
my_meth(foo:3, bar:4)

# later we see this, we do not know how the method is defined.
my_meth2(arg:100, arg2:10)

There is no way to tell if my_meth2 is using a hash or keyword arguments 
without looking it up. However, if keyword arguments used "=" instead, 
there would be no double checking.
my_meth2(arg=100, arg2=10)

A keyword argument that takes a symbol ends up looking very ugly (I 
guess "=" doesn't work well here, either):
foo(key::symbol) or
foo(key: :symbol)

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