1/// True values are `y`, `yes`, `t`, `true`, `on`, and `1`.
2pub(crate) const TRUE_LITERALS: [&str; 6] = ["y", "yes", "t", "true", "on", "1"];
3
4/// False values are `n`, `no`, `f`, `false`, `off`, and `0`.
5pub(crate) const FALSE_LITERALS: [&str; 6] = ["n", "no", "f", "false", "off", "0"];
6
7/// Converts a string literal representation of truth to true or false.
8///
9/// `false` values are `n`, `no`, `f`, `false`, `off`, and `0` (case insensitive).
10///
11/// Any other value will be considered as `true`.
12pub(crate) fn str_to_bool(val: impl AsRef<str>) -> Option<bool> {
13    let pat: &str = &val.as_ref().to_lowercase();
14    if TRUE_LITERALS.contains(&pat) {
15        Some(true)
16    } else if FALSE_LITERALS.contains(&pat) {
17        Some(false)
18    } else {
19        None
20    }
21}
22