Refactor: avoid intermediate allocations

Co-authored-by: ee7 <[email protected]>

Author: ynfle

src/representer/types.nim

@@ -1,4 +1,4 @@
-import std/[sequtils, tables]
+import std/tables
 import mapping
 
 type
@@ -10,5 +10,7 @@ type
     map: string
 
 proc switchKeysValues*(map: IdentMap): OrderedTable[string, NormalizedIdent] =
-  toSeq(map.pairs).mapIt((it[1], it[0])).toOrderedTable
+  result = collect:
+    for key, val in map.pairs:
+      {val: key}