pub const BOM_CHAR: char = '\u{FEFF}';Expand description
The same BOM as a char.
Use this for char-typed predicates like s.contains(BOM_CHAR)
or match c { BOM_CHAR => ... } instead of open-coding
'\u{FEFF}' — that scatters the BOM concept across every
detection site and re-creates the contract drift this module
exists to prevent.