/// Searches for the given needle in the given haystack.

///

/// If the perf-literal feature is enabled, then this uses the super optimized

/// memchr crate. Otherwise, it uses the naive byte-at-a-time implementation.

pub(crate) fn find_byte(needle: u8, haystack: &[u8]) -> Option<usize> {

    #[cfg(not(feature = "perf-literal"))]

    fn imp(needle: u8, haystack: &[u8]) -> Option<usize> {

        haystack.iter().position(|&b| b == needle)

    }

    #[cfg(feature = "perf-literal")]

    fn imp(needle: u8, haystack: &[u8]) -> Option<usize> {

        memchr::memchr(needle, haystack)

    }

    imp(needle, haystack)

}