On opening/scrolling some binary files: "vim-illuminate: An internal error has occured: false"Vim:E976: using Blob as a String"

[andis-sprinkis]

Describe the bug
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An error message occurs on opening and scrolling through some binary files.

To Reproduce
Steps to reproduce the behavior (include minimal init.vim or .vimrc):

1. nvim test.txt
   test.txt (this is a chunk of a WAV file from Wikipedia)
2. See error

   vim-illuminate: An internal error has occured: false"Vim:E976: using Blob as a String"
   

Config. - just vim-illuminate installed with lazy.nvim.

Note Omitting a minimal init.vim/init.lua/.vimrc will likely result in the issue being closed without explanation.

Output from :IlluminateDebug

buf_should_illuminate 1 true
config {
  case_insensitive_regex = false,
  delay = 100,
  filetype_overrides = {},
  filetypes_allowlist = {},
  filetypes_denylist = { "dirbuf", "dirvish", "fugitive" },
  min_count_to_highlight = 1,
  modes_allowlist = {},
  modes_denylist = {},
  providers = { "lsp", "treesitter", "regex" },
  providers_regex_syntax_allowlist = {},
  providers_regex_syntax_denylist = {},
  under_cursor = true
}
started false
provider table: 0x7ff0e85b7590 regex
`termguicolors` false

Expected behavior
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Screenshots

Additional context
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[RRethy]

Not sure how to fix this, I'll leave it open in case someone has any ideas. The error seems to be a result of string.format returning a blob which we then pass to vim.escape which is no bueno, but I'm not sure how to convert it to a string and I don't understand why string.format is even returning a blob. Looking at the Neovim source code would probably clear things up but I'm probably not going to spend a significant amount of time fixing this due to how rare it is.