:sig
bool to_bool(String s, bool fallback = false)

:params
s : string to parse
fallback : value returned when `s` is empty or not a recognized boolean token
return value : parsed bool, or `fallback`.

:see
>types
to_u64
to_s64
to_f64

:content
Parses a trimmed, case-insensitive boolean string.

Truthy tokens are `"1"`, `"true"`, `"yes"`, and `"on"`. Falsey tokens are `"0"`, `"false"`, `"no"`, and `"off"`. Empty or unrecognized strings return the fallback.

:example
print(to_bool("yes") ? "true\n" : "false\n");