Remove old json decode function

Author: lrvdijk

src/pyfrost/kmer_index.py

@@ -6,7 +6,6 @@
 """
 
 from __future__ import annotations
-import json
 import logging
 from collections import defaultdict
 from typing import TextIO, NamedTuple
@@ -23,13 +22,6 @@ class KmerPosition(NamedTuple):
     pos: int
 
 
-def json_decode(kv_pairs):
-    if kv_pairs[0][0] in {"contig_ids", "index"}:
-        return dict(kv_pairs)
-    else:
-        return {Kmer(k): KmerPosition(*v) for k, v in kv_pairs.items()}
-
-
 class KmerPosIndex:
     def __init__(self):
         self.contig_ids = []