Having trouble with a weird `is-at-least` function issue

[Joost Bremmer <joost@madeofmagicandwires.online>]

Hey everyone,

I've come up against a weird issue and I hope you can help me figure it
out. It first presented itself with the zsh-syntax-highlighting plugin, so
that's the example I'll use.

Syntax-highlighting tries to autoload the `is-at-least` function but then
when CALLING said function it gives the following error: "is-at-least:
function not defined by file".
Manually following the same steps gives the same results.

Now it's got me a bit stumped. The is-at-least source file exists on my
system, the `functions/Misc` folder is properly added to $fpath, and other
functions located in that folder work perfectly fine, and I can't think of
anything else that might be affecting it.

I've of course looked around online for the issue, but haven't found
anything similar. I can therefore only assume it isn't a general bug with
syntax-highlighting or zsh itself and there's something off about my setup,
I just don't know WHAT.

If anyone can point me in the right direction I'd be very grateful.

Sincerely,
Joost Bremmer