What does it mean when code has 2 colons

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#1

So I was looking through roblox’s MouseLockController and found this:

self.boundKeys[#self.boundKeys+1] = keyEnum :: Enum.KeyCode

I know about typechecking, but thats one :
Is this the same as typechecking? If so, or even if not. What does it do / mean?

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#2

This is type casting, you can find it here:

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#3

1 colon is type declaring, 2 colons is type casting.

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