diff --git a/test/Feature/RpcSpec.hs b/test/Feature/RpcSpec.hs
index eb95bd6fd..5426d40b3 100644
--- a/test/Feature/RpcSpec.hs
+++ b/test/Feature/RpcSpec.hs
@@ -268,21 +268,102 @@ spec actualPgVersion =
           { matchHeaders = [matchContentTypeJson] }
 
     context "proc argument types" $ do
-      it "accepts a variety of arguments" $
-        post "/rpc/varied_arguments"
-            [json| {
-              "double": 3.1,
-              "varchar": "hello",
-              "boolean": true,
-              "date": "20190101",
-              "money": 0,
-              "enum": "foo",
-              "integer": 43,
-              "json": {"some key": "some value"},
-              "jsonb": {"another key": [1, 2, "3"]}
-            } |]
+      -- different syntax for array needed for pg<10
+      when (actualPgVersion < pgVersion100) $
+        it "accepts a variety of arguments (Postgres < 10)" $
+          post "/rpc/varied_arguments"
+              [json| {
+                "double": 3.1,
+                "varchar": "hello",
+                "boolean": true,
+                "date": "20190101",
+                "money": 0,
+                "enum": "foo",
+                "arr": "{a,b,c}",
+                "integer": 43,
+                "json": {"some key": "some value"},
+                "jsonb": {"another key": [1, 2, "3"]}
+              } |]
+            `shouldRespondWith`
+              [json| {
+                "double": 3.1,
+                "varchar": "hello",
+                "boolean": true,
+                "date": "2019-01-01",
+                "money": "$0.00",
+                "enum": "foo",
+                "arr": ["a", "b", "c"],
+                "integer": 43,
+                "json": {"some key": "some value"},
+                "jsonb": {"another key": [1, 2, "3"]}
+              } |]
+              { matchHeaders = [matchContentTypeJson] }
+
+      when (actualPgVersion >= pgVersion100) $
+        it "accepts a variety of arguments (Postgres >= 10)" $
+          post "/rpc/varied_arguments"
+              [json| {
+                "double": 3.1,
+                "varchar": "hello",
+                "boolean": true,
+                "date": "20190101",
+                "money": 0,
+                "enum": "foo",
+                "arr": ["a", "b", "c"],
+                "integer": 43,
+                "json": {"some key": "some value"},
+                "jsonb": {"another key": [1, 2, "3"]}
+              } |]
+            `shouldRespondWith`
+              [json| {
+                "double": 3.1,
+                "varchar": "hello",
+                "boolean": true,
+                "date": "2019-01-01",
+                "money": "$0.00",
+                "enum": "foo",
+                "arr": ["a", "b", "c"],
+                "integer": 43,
+                "json": {"some key": "some value"},
+                "jsonb": {"another key": [1, 2, "3"]}
+              } |]
+              { matchHeaders = [matchContentTypeJson] }
+
+      it "accepts a variety of arguments with GET" $
+        -- without JSON / JSONB here, because passing those via query string is useless - they just become a "json string" all the time
+        get "/rpc/varied_arguments?double=3.1&varchar=hello&boolean=true&date=20190101&money=0&enum=foo&arr=%7Ba,b,c%7D&integer=43"
           `shouldRespondWith`
-            [json|"Hi"|]
+              [json| {
+                "double": 3.1,
+                "varchar": "hello",
+                "boolean": true,
+                "date": "2019-01-01",
+                "money": "$0.00",
+                "enum": "foo",
+                "arr": ["a", "b", "c"],
+                "integer": 43,
+                "json": {},
+                "jsonb": {}
+              } |]
+            { matchHeaders = [matchContentTypeJson] }
+
+      it "accepts a variety of arguments from an html form" $
+        request methodPost "/rpc/varied_arguments"
+            [("Content-Type", "application/x-www-form-urlencoded")]
+            "double=3.1&varchar=hello&boolean=true&date=20190101&money=0&enum=foo&arr=%7Ba,b,c%7D&integer=43"
+          `shouldRespondWith`
+              [json| {
+                "double": 3.1,
+                "varchar": "hello",
+                "boolean": true,
+                "date": "2019-01-01",
+                "money": "$0.00",
+                "enum": "foo",
+                "arr": ["a", "b", "c"],
+                "integer": 43,
+                "json": {},
+                "jsonb": {}
+              } |]
             { matchHeaders = [matchContentTypeJson] }
 
       it "parses embedded JSON arguments as JSON" $
diff --git a/test/Feature/StructureSpec.hs b/test/Feature/StructureSpec.hs
index 02ce083be..c288edb8f 100644
--- a/test/Feature/StructureSpec.hs
+++ b/test/Feature/StructureSpec.hs
@@ -425,7 +425,8 @@ spec = do
                   "boolean",
                   "date",
                   "money",
-                  "enum"
+                  "enum",
+                  "arr"
                 ],
                 "properties": {
                   "double": {
@@ -452,6 +453,10 @@ spec = do
                     "format": "enum_menagerie_type",
                     "type": "string"
                   },
+                  "arr": {
+                    "format": "text[]",
+                    "type": "string"
+                  },
                   "integer": {
                     "format": "integer",
                     "type": "integer"
diff --git a/test/fixtures/schema.sql b/test/fixtures/schema.sql
index 1e36b589c..c56587059 100755
--- a/test/fixtures/schema.sql
+++ b/test/fixtures/schema.sql
@@ -221,23 +221,34 @@ CREATE FUNCTION varied_arguments(
   date date,
   money money,
   enum enum_menagerie_type,
+  arr text[],
   "integer" integer default 42,
   json json default '{}',
   jsonb jsonb default '{}'
-) RETURNS text
-    LANGUAGE sql
+) RETURNS json
+LANGUAGE sql
 AS $_$
-  SELECT 'Hi'::text;
+  SELECT json_build_object(
+    'double', double,
+    'varchar', "varchar",
+    'boolean', "boolean",
+    'date', date,
+    'money', money,
+    'enum', enum,
+    'arr', arr,
+    'integer', "integer",
+    'json', json,
+    'jsonb', jsonb
+  );
 $_$;
 
-COMMENT ON FUNCTION varied_arguments(double precision, character varying, boolean, date, money, enum_menagerie_type, integer, json, jsonb) IS
+COMMENT ON FUNCTION varied_arguments(double precision, character varying, boolean, date, money, enum_menagerie_type, text[], integer, json, jsonb) IS
 $_$An RPC function
 
 Just a test for RPC function arguments$_$;
 
 
 CREATE FUNCTION json_argument(arg json) RETURNS text
-
 LANGUAGE sql
 AS $_$
   SELECT json_typeof(arg);