fix: make tests work with nimble lock file

Author: markspanbroek

serde.nimble

@@ -11,8 +11,4 @@ requires "chronicles >= 0.10.3"
 requires "questionable >= 0.10.13 & < 0.11.0"
 requires "stint"
 requires "stew"
-
-task test, "Run the test suite":
-  exec "nimble install -d -y"
-  withDir "tests":
-    exec "nimble test"
+requires "asynctest >= 0.5.1 & < 0.6.0"

serde/json/deserializer.nim

@@ -322,7 +322,7 @@ proc fromJson*(T: typedesc[StUint or StInt], json: string): ?!T =
   T.fromJson(newJString(json))
 
 proc fromJson*[T: ref object or object](_: type ?T, json: string): ?!Option[T] =
-  when T is (StUInt or StInt):
+  when T is (StUint or StInt):
     let jsn = newJString(json)
   else:
     let jsn = ?JsonNode.parse(json) # full qualification required in-module only