Even if 'type -w' returns 'none', it still hashes it in $commands:
http://www.zsh.org/mla/workers/2016/msg01583.html
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README.md
zsh-syntax-highlighting / highlighters
Navigate into the individual highlighters' documentation to see
what styles ($ZSH_HIGHLIGHT_STYLES keys) each highlighter defines.
Refer to the documentation on highlighters for further information.