diff --git a/rest_framework/fields.py b/rest_framework/fields.py
index f4fd26539..7b934ca39 100644
--- a/rest_framework/fields.py
+++ b/rest_framework/fields.py
@@ -678,22 +678,27 @@ class BooleanField(Field):
     default_empty_html = False
     initial = False
     TRUE_VALUES = {
-        't', 'T',
-        'y', 'Y', 'yes', 'Yes', 'YES',
-        'true', 'True', 'TRUE',
-        'on', 'On', 'ON',
-        '1', 1,
-        True
+        't',
+        'y',
+        'yes',
+        'true',
+        'on',
+        '1',
+        1,
+        True,
     }
     FALSE_VALUES = {
-        'f', 'F',
-        'n', 'N', 'no', 'No', 'NO',
-        'false', 'False', 'FALSE',
-        'off', 'Off', 'OFF',
-        '0', 0, 0.0,
-        False
+        'f',
+        'n',
+        'no',
+        'false',
+        'off',
+        '0',
+        0,
+        0.0,
+        False,
     }
-    NULL_VALUES = {'null', 'Null', 'NULL', '', None}
+    NULL_VALUES = {'null', '', None}
 
     def __init__(self, **kwargs):
         if kwargs.get('allow_null', False):
@@ -701,22 +706,30 @@ class BooleanField(Field):
             self.initial = None
         super().__init__(**kwargs)
 
+    @staticmethod
+    def _lower_if_str(value):
+        if isinstance(value, str):
+            return value.lower()
+        return value
+
     def to_internal_value(self, data):
-        with contextlib.suppress(TypeError):
-            if data in self.TRUE_VALUES:
+        try:
+            if self._lower_if_str(data) in self.TRUE_VALUES:
                 return True
-            elif data in self.FALSE_VALUES:
+            elif self._lower_if_str(data) in self.FALSE_VALUES:
                 return False
-            elif data in self.NULL_VALUES and self.allow_null:
+            elif self._lower_if_str(data) in self.NULL_VALUES and self.allow_null:
                 return None
-        self.fail('invalid', input=data)
+        except TypeError:  # Input is an unhashable type
+            pass
+        self.fail("invalid", input=data)
 
     def to_representation(self, value):
-        if value in self.TRUE_VALUES:
+        if self._lower_if_str(value) in self.TRUE_VALUES:
             return True
-        elif value in self.FALSE_VALUES:
+        elif self._lower_if_str(value) in self.FALSE_VALUES:
             return False
-        if value in self.NULL_VALUES and self.allow_null:
+        if self._lower_if_str(value) in self.NULL_VALUES and self.allow_null:
             return None
         return bool(value)
 
diff --git a/tests/test_fields.py b/tests/test_fields.py
index bf25b71b8..4ff741e56 100644
--- a/tests/test_fields.py
+++ b/tests/test_fields.py
@@ -690,8 +690,24 @@ class TestBooleanField(FieldValues):
     Valid and invalid values for `BooleanField`.
     """
     valid_inputs = {
+        'True': True,
+        'TRUE': True,
+        'tRuE': True,
+        't': True,
+        'T': True,
         'true': True,
+        'on': True,
+        'ON': True,
+        'oN': True,
+        'False': False,
+        'FALSE': False,
+        'fALse': False,
+        'f': False,
+        'F': False,
         'false': False,
+        'off': False,
+        'OFF': False,
+        'oFf': False,
         '1': True,
         '0': False,
         1: True,
@@ -704,8 +720,24 @@ class TestBooleanField(FieldValues):
         None: ['This field may not be null.']
     }
     outputs = {
+        'True': True,
+        'TRUE': True,
+        'tRuE': True,
+        't': True,
+        'T': True,
         'true': True,
+        'on': True,
+        'ON': True,
+        'oN': True,
+        'False': False,
+        'FALSE': False,
+        'fALse': False,
+        'f': False,
+        'F': False,
         'false': False,
+        'off': False,
+        'OFF': False,
+        'oFf': False,
         '1': True,
         '0': False,
         1: True,
@@ -726,7 +758,7 @@ class TestBooleanField(FieldValues):
             with pytest.raises(serializers.ValidationError) as exc_info:
                 field.run_validation(input_value)
             expected = ['Must be a valid boolean.']
-            assert exc_info.value.detail == expected
+            assert exc_info.value.detail == expected        
 
 
 class TestNullableBooleanField(TestBooleanField):
@@ -2638,4 +2670,4 @@ class TestValidationErrorCode:
                     code=expected_code
                 ),
             ]
-        }
+        }
\ No newline at end of file