Fix runtime error when there is a decimal in context

Author: ir4y

fhirpathpy/engine/nodes.py

@@ -839,7 +839,7 @@ def __eq__(self, value):
         return self.data == value
 
     def __hash__(self):
-        data_hash = hash(json.dumps(self.data, sort_keys=True))
+        data_hash = hash(json.dumps(self.data, sort_keys=True, default=str))
         path_hash = hash(self.path)
         return hash((data_hash, path_hash))
 

tests/test_context.py

@@ -0,0 +1,20 @@
+from fhirpathpy import evaluate as fhirpath
+from decimal import Decimal
+
+
+def use_decimal_in_context_test():
+    assert fhirpath(
+        {},
+        "%QuestionnaireResponse.repeat(item).where(linkId='blood-pressure-systolic').answer.valueQuantity",
+        {
+            "QuestionnaireResponse": {
+                "resourceType": "QuestionnaireResponse",
+                "item": [
+                    {
+                        "answer": [{"valueQuantity": {"value": Decimal(120)}}],
+                        "linkId": "blood-pressure-systolic",
+                    }
+                ],
+            }
+        },
+    ) == [{"value": Decimal(120)}]