def bt.put
import emerging-ezaudio@0.4.0.0/src/mp3_enc.bend as Mp3Encimport Base
1097def bt.put(xs: List<&2, F32>, a: Array<F32>, +ii: U32) -> Array<F32>:
1098 match xs:
1099 case Nil{}:
1100 a
1101 case +hd <> tl:
1102 bt.put(tl, Array.set(F32, a, ii, hd), (ii + 1 : U32))