Make registers picker behave like normal mode pasting

[crater2150]

Is your feature request related to a problem? Please describe.
Currently, pasting from the builtin.registers picker behaves differently from pasting with p in normal mode, when the register contains data from a linewise or blockwise yank. For example, take a file with the following content:

Hello World
Hello World

With the cursor on the first H, then copying with y$, the pasting via telescope's picker behaves the same as via p, resulting in:

HHello Worldello World
Hello World

But if I do a linewise copy, i.e. yy with the cursor anywhere on the first line, then p, the result is

Hello World
Hello World
Hello World

while the telescope picker has the same result as the character-wise copy from before.
Similarly, copying the two "Hello" via visual-block selection, then pasting with p (with the cursor on the first char again), results in

HHelloello World
HHelloello World

while telescope.builtin.registers() results in

HHello
Helloello World
Hello World

Describe the solution you'd like
Pasting via p and via the builtin.registers() picker should behave the same.

Additional context
I've briefly looked into the code. I don't have much experience with the nvim API, but it seems vim.fn.getregtype can be used to check, which type of copying was used.

[crater2150]

I tried to fix the problem by using nvim_put and vim.fn.getregtype(): crater2150@c49aa3c

This seems to work for block registers, but adds an extra newline with line registers. Going to look into it futher tomorrow