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TIL: Macro Registers in Vim
The registers used for recording macros in vim are actually just the normal registers! That means that you can record a macro, then print it to the buffer, fix issues, and yank it back to the register.
For instance, if I record a simple macro, like qa2dw, I can print it back out with "ap and get 2dw.
If I then edit that text to read 3dw and yank it to register a with "ay, the macro will perform 3dw instead!