vim.lsp.buf.format with range has strange behaviour?

[ccbiozhaw]

Neovim version (nvim -v)

0.8

Language server name/version

latest

Operating system/version

macOS

Steps to reproduce using "nvim -u minimal_init.lua"

Python:

def fn(abc  ):
    print('HELLO'  )
    return abc   + 1

lua:

function fn(abc )
  print("hello" )
  return abc  + 1
end

ts:

function fn(abc  ) {
  console.log("hello" );
  return abc   + 1
}

command used:

:lua vim.lsp.buf.format({
range={
["start"] = {1,0},
["end"] = {2,-1}
}
})

Expected behavior

correct range formatting

Actual behavior

Python:
---- nothing happens ----

def fn(abc  ):
    print('HELLO'  )
    return abc   + 1

lua:
--- keeps adding newline after format range ---

function fn(abc)
  print("hello")
  return abc + 1

end

ts:
--- formats one line too little ---

function fn(abc  ) {
  console.log("hello" );
  return abc   + 1
}

I want to point out, that if I format the entire buffer with

lua vim.lsp.buf.format()

everything is formatted correctly. Python for example does not format no matter the range if I specify one

Log file

No response