nvim_buf_get_lines not working

[CrossR]

Hey!

I've been messing with this, and hit a weird bug where if I called nvim.api.buf_set_lines, I got back the error pynvim.api.nvim.NvimError: b"object of type 'int' has no len()".

This was when calling it with 0, 0, -1, True.

Looking at the code for nvim_buf_get_lines and set lines, it looks like the first argument buffer is treated as the buffer, rather than the buffer index, as implied by the nvim docs :

Parameters: 
                    {buffer}           Buffer handle, or 0 for current buffer

Or over in

EXT Type	C type					Data
  ------------------------------------------------------------------------
  Buffer	enum value kObjectTypeBuffer		|bufnr()|

I could be entirely wrong, and my code is just working oddly, but if I add in a buffer_contents = vim.buffers[buffer] (or I guess vim.current.buffer for buffer == 0) and then use buffer_contents rather than buffer, the set and get work as expected.

Is that expected, or am I just using the function wrong?