file_is_ascii

Every byte in the file must be < 0x80 (pure ASCII), except codepoints listed in allow:. Strict variant of is_text for configs that must round-trip through strictly-ASCII tools. allow: exempts specific non-ASCII codepoints — each entry a single character ("ö"), a U+XXXX codepoint, or a U+XXXX-U+YYYY inclusive range (curl keeps its source ASCII but allows ö in “Björn”; the recurring need across llvm / vscode / elixir). With allow: the file is decoded as UTF-8 and checked per character; without it, the strict byte-level fast path is used.

- id: source-ascii-but-allow-accents
  kind: file_is_ascii
  paths: "src/**"
  allow: ["ö", "U+00E9", "U+2010-U+2015"]   # ö, é, and the dash block
  level: error

---

Options

Option	Type	Required	Default	Description
allow	list of string		[]	Permitted non-ASCII codepoints - each a single character (e.g. “o-umlaut”), a U+XXXX codepoint, or a U+XXXX-U+YYYY inclusive range.

Plus the common paths, level, id, and when fields. This table is generated from the JSON Schema; option types and defaults are authoritative.