fix(postgrest): normalize boolean values in is_() to lowercase literals

src/postgrest/src/postgrest/base_request_builder.py

@@ -366,6 +366,10 @@ def is_(self: Self, column: str, value: Any) -> Self:
         """
         if value is None:
             value = "null"
+        elif value is True:
+            value = "true"
+        elif value is False:
+            value = "false"
         return self.filter(column, Filters.IS, value)
 
     def like(self: Self, column: str, pattern: str) -> Self:

src/postgrest/tests/_async/test_filter_request_builder.py

@@ -282,6 +282,26 @@ def test_is_(filter_request_builder):
     assert str(builder.request.params) == "x=is.a"
 
 
+def test_is_true(filter_request_builder):
+    # PostgREST's `is` operator is case-sensitive and only accepts lowercase
+    # trilean literals, so a Python ``True`` must become ``is.true``.
+    builder = filter_request_builder.is_("x", True)
+
+    assert str(builder.request.params) == "x=is.true"
+
+
+def test_is_false(filter_request_builder):
+    builder = filter_request_builder.is_("x", False)
+
+    assert str(builder.request.params) == "x=is.false"
+
+
+def test_is_none(filter_request_builder):
+    builder = filter_request_builder.is_("x", None)
+
+    assert str(builder.request.params) == "x=is.null"
+
+
 def test_in_(filter_request_builder):
     builder = filter_request_builder.in_("x", ["a", "b"])
 

src/postgrest/tests/_sync/test_filter_request_builder.py

@@ -282,6 +282,26 @@ def test_is_(filter_request_builder):
     assert str(builder.request.params) == "x=is.a"
 
 
+def test_is_true(filter_request_builder):
+    # PostgREST's `is` operator is case-sensitive and only accepts lowercase
+    # trilean literals, so a Python ``True`` must become ``is.true``.
+    builder = filter_request_builder.is_("x", True)
+
+    assert str(builder.request.params) == "x=is.true"
+
+
+def test_is_false(filter_request_builder):
+    builder = filter_request_builder.is_("x", False)
+
+    assert str(builder.request.params) == "x=is.false"
+
+
+def test_is_none(filter_request_builder):
+    builder = filter_request_builder.is_("x", None)
+
+    assert str(builder.request.params) == "x=is.null"
+
+
 def test_in_(filter_request_builder):
     builder = filter_request_builder.in_("x", ["a", "b"])