Constant proptest::char::DEFAULT_SPECIAL_CHARS

pub const DEFAULT_SPECIAL_CHARS: &[char] = &['/', '\\', '$', '.', '*', '{', '\'', '\"', '`', ':', '?', '%', '=', '&',
  '<', '\u{0}', '\t', '\r', '\n', '\u{b}', '\u{1b}', '\u{7f}', '\u{a5}',
  '\u{468}', '\u{feff}', '\u{fffd}', '\u{1f574}']

A default set of characters to consider as "special" during character generation.

Most of the characters here were chosen specifically because they are difficult to handle in particular contexts.