2 files changed, 16 insertions, 11 deletions
diff --git a/lib/sqlalchemy/dialects/postgresql/array.py b/lib/sqlalchemy/dialects/postgresql/array.py
index 91bb89ea9..c2d99845f 100644
--- a/lib/sqlalchemy/dialects/postgresql/array.py
+++ b/lib/sqlalchemy/dialects/postgresql/array.py
@@ -331,12 +331,6 @@ class ARRAY(sqltypes.ARRAY):
             )
 
     @util.memoized_property
-    def _require_cast(self):
-        return self._against_native_enum or isinstance(
-            self.item_type, sqltypes.JSON
-        )
-
-    @util.memoized_property
     def _against_native_enum(self):
         return (
             isinstance(self.item_type, sqltypes.Enum)
@@ -344,10 +338,7 @@ class ARRAY(sqltypes.ARRAY):
         )
 
     def bind_expression(self, bindvalue):
-        if self._require_cast:
-            return expression.cast(bindvalue, self)
-        else:
-            return bindvalue
+        return bindvalue
 
     def bind_processor(self, dialect):
         item_proc = self.item_type.dialect_impl(dialect).bind_processor(
diff --git a/lib/sqlalchemy/dialects/postgresql/psycopg2.py b/lib/sqlalchemy/dialects/postgresql/psycopg2.py
index a52eacd8b..1969eb844 100644
--- a/lib/sqlalchemy/dialects/postgresql/psycopg2.py
+++ b/lib/sqlalchemy/dialects/postgresql/psycopg2.py
@@ -450,6 +450,7 @@ from ... import processors
 from ... import types as sqltypes
 from ... import util
 from ...engine import cursor as _cursor
+from ...sql import elements
 from ...util import collections_abc
 
 
@@ -597,7 +598,20 @@ class PGExecutionContext_psycopg2(PGExecutionContext):
 
 
 class PGCompiler_psycopg2(PGCompiler):
-    pass
+    def visit_bindparam(self, bindparam, skip_bind_expression=False, **kw):
+
+        text = super(PGCompiler_psycopg2, self).visit_bindparam(
+            bindparam, skip_bind_expression=skip_bind_expression, **kw
+        )
+        # note that if the type has a bind_expression(), we will get a
+        # double compile here
+        if not skip_bind_expression and bindparam.type._is_array:
+            text += "::%s" % (
+                elements.TypeClause(bindparam.type)._compiler_dispatch(
+                    self, skip_bind_expression=skip_bind_expression, **kw
+                ),
+            )
+        return text
 
 
 class PGIdentifierPreparer_psycopg2(PGIdentifierPreparer):