Theme dev (Selenized) help: SpellRare and undercurl not working in Vim, works in NeoVim

Hi,

I'm currently working on a theme called Selenized https://github.com/jan-warchol/selenized/

We're using https://github.com/lifepillar/vim-colortemplate to template
our theme.

The issue I'm having is https://github.com/jan-warchol/selenized/pull/71#pullrequestreview-375757756

We cannot seem to get SpellRare to work in Vim, yet it works in NeoVim.

The Vim config is extremely simple:

set t_Co=16
set termguicolors
colorscheme selenized
set spelllang=en_au
setlocal spell spelllang=en_au
set spell
set nu
syntax on

My NeoVim config is the same except that it doesn't have set t_Co=16
because that's not supported.

We want the theme when running in Vim to look the same as it does in
NeoVim.

I included a screenshot:

https://user-images.githubusercontent.com/48640805/76826205-c3640200-6813-11ea-859f-e6c9a3c6e0c4.png

as well as the generated theme:

https://github.com/jan-warchol/selenized/pull/71#discussion_r401316369

I'm hoping someone can give us a hand as we really want to support Vim
too, not just NeoVim.

--
Daniel Gray (dng) 0x41911F722B0F9AE3
https://social.privacytools.io/@dngray

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