Vim 9 script questions

Hello,

It's my understanding that Vim 9 functions will get compiled and will be faster than legacy functions, so I'm changing some stuff I've written, but I have some questions:

1. How can I use a Vim 9 function in a mapping? Something like: nmap abc <CMD>call Vim9Func()<cr>

2. Can I call a Vim 9 function defined in another script from a legacy Vim script? How?

3. Can a Vim 9 function be defined inside another function? I want to call an outer function that defines some variables and then returns a function that will have access to those variables, as in a closure or a partial function (where the first few arguments to the function are preset).

Examples of each would be great, if possible, please. I did look through the documentation, but wasn't able to work these out for myself. 

Thank you very much for any help!

--

Salman

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