Function is_or Copy item path

Returns false if environment variable value if falsy.
Any other value is returned as true.
The value is falsy if it is one of the following:

• Empty string
• “false” (case insensitive)
• “no” (case insensitive)
• “0”

§Arguments

• key - The environment variable name
• default_value - In case the environment variable is not defined, this value will be returned.

§Example

fn main() {
    envmnt::set_bool("FLAG_VAR", true);
    assert!(envmnt::is_equal("FLAG_VAR", "true"));

    let flag_value = envmnt::is_or("FLAG_VAR", false);
    assert!(flag_value);
}