Any ways to set leader key to space?

[ghost]

my .xvimrc

set number
set cursorline
set clipboard=unnamed " set system clipboard
nnoremap <leader>p :xccmd openQuickly<CR>
let mapleader = "\<Space>" " This works in Vim and NeoVim except XVim

I tried to map leader key to space key, and that doesn't work

Environments

• Xcode Version [Version 7.2.1 (7C1002)]
• XVim branch and revision [master-latest]
• Keyboard Language [English]
• Input source language [English]

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[cjappl]

See here: https://github.com/XVimProject/XVim/issues/669

Seems to be no leader support