iina+ formula is missing from Homebrew's cask API

[rqel]

Verification

• I understand that if I ignore these instructions, my issue may be closed without review.
• I have retried my command with --force.
• I ran brew update-reset && brew update and retried my command.
• I ran brew doctor, fixed as many issues as possible and retried my command.
• I have checked the instructions for reporting bugs.
• I made doubly sure this is not a checksum does not match / SHA256 mismatch error (do not open an issue before trying to open a PR to fix first).

Description of issue

The iina+ cask formula (available here) does not appear in the official Homebrew cask API (https://formulae.brew.sh/api/cask.json).

It seems that the + sign in the formula name is causing it not to be recognized by Homebrew commands like brew install --cask iina+, brew search iina+, and brew info iina+.

I verified that the formula is in the official Homebrew Cask repository but is not included in the API list.

This issue may be related to the special character + in the formula name, which could be causing it to not be recognized correctly by Homebrew.