Function lower_key

modules/llrt_fetch/src/headers.rs:31–34

ASCII-lowercase the key in place (HTTP headers are ASCII-only) and wrap in `Rc `, saving one allocation vs `key.to_lowercase().into()`.

(mut key: String)

/// ASCII-lowercase the key in place (HTTP headers are ASCII-only) and wrap in `Rc<str>`,
/// saving one allocation vs `key.to_lowercase().into()`.
fn lower_key(mut key: String) -> ImmutableString {
    key.make_ascii_lowercase();
    key.into()
}

// https://fetch.spec.whatwg.org/#concept-headers-guard
#[derive(Clone, Copy, Default, PartialEq)]