in rust/ccommon-backend/src/option/parse.rs [259:269]
fn trim_bytes(mut slice: &[u8]) -> &[u8] {
while is_space(slice.first().copied()) {
slice = slice.split_first().unwrap().1;
}
while is_space(slice.last().copied()) {
slice = slice.split_last().unwrap().1
}
slice
}