pub fn split_keyval_source(kv: &str) -> Vec<(String, String)>Expand description
Split a keyval dict’s TeX-source form ("k=v, k2={v, 2}") into
(key, value) pairs: comma/equals splitting at brace depth 0 only, one
level of outer braces stripped from values, whitespace trimmed, empty
keys dropped (keyval semantics).