def grp.add
import bend-kit-sigv4@0.11.0.1/sigv4.bend as Sigv4import Base
217def grp.add(acc: List<&2, Sigma<&2, &2, String, _ => String>>, +n: String, +v: String) -> List<&2, Sigma<&2, &2, String, _ => String>>:
218 match acc:
219 case Nil{}:
220 [(n, v)]
221 case Con{(+pn, +pv), rest}:
222 grp.if(String.eq(pn, n), n, v, pn, pv, rest)