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This allows users to define behaviors for arbitrary registers. These
registers can be any character including multibyte characters. This
means that any character may be used as a register and if that register
is not a builtin register, it will defer to a user-defined vimscript
function for behavior.
This is done throw an option called 'userregfun'
The function that 'userregfun' defines is a function that takes 3
arguments:
action - Either set to "put" or "yank"
register - The character representing the register.
content - If the action is "yank" this string contains the content
yanked.
Multibyte registers are still broken for expressions. So while
let @&=xyz
Works as expected,
let @λ=xyz
will still throw a parse error.
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