What is 't: number' in functions

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#1

As an example, in the Thread script made by CloneTrooper, or fastwait, you see some functions like this:
function Thread:Wait(t: number?)

what is the t: number?

#2

I think it’s the type of the variable, this time it’s a number, but if you do t: string, it should be a string.
I don’t really know how it works but in C, if t is not a number and you call a function where t has to be a number, it will error.
Correct me if I’m wrong

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#3

Cool! That seems nice to use in modules! Now I dont have to use type() in an if everytime.

#4

Well you still have to do that because strict mode is only used by typechecker in edit mode, those type declarations gets ignored by intepreter on runtime.