diff --git a/preserves.nimble b/preserves.nimble
index 7538ef5..fea3520 100644
--- a/preserves.nimble
+++ b/preserves.nimble
@@ -1,6 +1,6 @@
 # Package
 
-version = "20230720"
+version = "20230723"
 author        = "Emery Hemingway"
 description   = "data model and serialization format"
 license       = "Unlicense"
diff --git a/src/preserves/private/macros.nim b/src/preserves/private/macros.nim
index 407fbc9..60c3601 100644
--- a/src/preserves/private/macros.nim
+++ b/src/preserves/private/macros.nim
@@ -30,16 +30,16 @@ proc extractTypeImpl(n: NimNode): NimNode =
 
 proc customPragmaNode(n: NimNode): NimNode =
   expectKind(n, {nnkSym, nnkDotExpr, nnkBracketExpr, nnkTypeOfExpr, nnkType, nnkCheckedFieldExpr})
-  let
+  var
     typ = n.getTypeInst()
 
   if typ.kind == nnkBracketExpr and typ.len > 1 and typ[1].kind == nnkProcTy:
     return typ[1][1]
   elif typ.typeKind == ntyTypeDesc:
-    let impl = getImpl(
-      if kind(typ[1]) == nnkBracketExpr: typ[1][0]
-      else: typ[1]
-    )
+    typ = typ[1]
+    while kind(typ) == nnkBracketExpr:
+      typ = typ[0]
+    let impl = getImpl(typ)
     if impl.kind == nnkNilLit:
       return impl
     elif impl[0].kind == nnkPragmaExpr: