diff --git a/polygraph/types/basic_type.py b/polygraph/types/basic_type.py
index 3498d26..26e54b8 100644
--- a/polygraph/types/basic_type.py
+++ b/polygraph/types/basic_type.py
@@ -1,3 +1,5 @@
+from functools import wraps
+
 from polygraph.exceptions import PolygraphSchemaError, PolygraphValueError
 from polygraph.types.definitions import TypeDefinition, TypeKind
 from polygraph.utils.trim_docstring import trim_docstring
@@ -7,6 +9,22 @@ def typedef(type_):
     return type_.__type
 
 
+type_builder_registry = {}
+
+
+def type_builder_cache(method):
+    @wraps(method)
+    def wrapper(cls, *args):
+        unique_args = frozenset(args)
+        if (cls, unique_args) in type_builder_registry:
+            return type_builder_registry[(cls, unique_args)]
+        else:
+            return_val = method(cls, *args)
+            type_builder_registry[(cls, unique_args)] = return_val
+            return return_val
+    return wrapper
+
+
 class PolygraphTypeMeta(type):
     def __new__(cls, name, bases, namespace):
         default_description = trim_docstring(namespace.get("__doc__", ""))
@@ -95,6 +113,7 @@ class Union(PolygraphOutputType, PolygraphType):
     GraphQL Object types, but provides for no guaranteed fields between
     those types.
     """
+    @type_builder_cache
     def __new__(cls, *types):
         types = set(types)
         assert len(types) >= 2, "Unions must consist of more than 1 type"
@@ -135,6 +154,7 @@ class List(PolygraphType):
     each item in the list is serialized as per the item type.
     """
 
+    @type_builder_cache
     def __new__(cls, type_):
         type_name = typedef(type_).name
 
@@ -160,6 +180,7 @@ class NonNull(PolygraphType):
     """
     Represents a type for which null is not a valid result.
     """
+    @type_builder_cache
     def __new__(cls, type_):
         type_name = typedef(type_).name
 

Implement GraphQL type cache for GraphQL meta-types
diff --git a/polygraph/types/tests/test_union.py b/polygraph/types/tests/test_union.py
index 0c60c7d..07abe3d 100644
--- a/polygraph/types/tests/test_union.py
+++ b/polygraph/types/tests/test_union.py
@@ -5,11 +5,13 @@ from polygraph.types.basic_type import Union
 from polygraph.types.scalar import Float, Int, String
 
 
-@skip  # FIXME
+# @skip  # FIXME
 class UnionTypeTest(TestCase):
     def test_commutativity(self):
         self.assertEqual(Union(String, Int), Union(Int, String))
+        self.assertEqual(Union(String, Int, Float), Union(Float, String, Int, String))
 
+    @skip
     def test_associativity(self):
         self.assertEqual(
             Union(Union(String, Int), Float),
@@ -22,6 +24,7 @@ class UnionTypeTest(TestCase):
             Union(String, Int),
         )
 
+    @skip
     def test_pipe_operator_with_more_than_two_types(self):
         self.assertEqual(
             String | Int | Float,

pip install -e .[dev]
parse_log_pytest
pytest
pytest
apt-get update apt-get install -y gcc
3.6
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
args==0.1.0
attrs @ file:///opt/conda/conda-bld/attrs_1642510447205/work
autopep8==2.0.4
backcall==0.2.0
certifi==2021.5.30
charset-normalizer==2.0.12
clint==0.5.1
decorator==5.1.1
flake8==2.5.5
graphql-core==3.2.6
idna==3.10
importlib-metadata @ file:///tmp/build/80754af9/importlib-metadata_1631916693255/work
iniconfig @ file:///home/linux1/recipes/ci/iniconfig_1610983019677/work
ipython==7.16.3
ipython-genutils==0.2.0
isort==5.10.1
jedi==0.17.2
mccabe==0.4.0
more-itertools @ file:///tmp/build/80754af9/more-itertools_1637733554872/work
packaging @ file:///tmp/build/80754af9/packaging_1637314298585/work
parso==0.7.1
pep8==1.7.1
pexpect==4.9.0
pickleshare==0.7.5
pkginfo==1.10.0
pluggy @ file:///tmp/build/80754af9/pluggy_1615976315926/work
-e git+https://github.com/polygraph-python/polygraph.git@15e259607a85cddd45f2b0a44115b7d430970a25#egg=polygraph
prompt-toolkit==3.0.36
ptyprocess==0.7.0
pudb==2017.1.2
py @ file:///opt/conda/conda-bld/py_1644396412707/work
pycodestyle==2.10.0
pyflakes==1.0.0
Pygments==2.14.0
pyparsing @ file:///tmp/build/80754af9/pyparsing_1635766073266/work
pytest==6.2.4
requests==2.27.1
requests-toolbelt==1.0.0
six==1.17.0
toml @ file:///tmp/build/80754af9/toml_1616166611790/work
tomli==1.2.3
traitlets==4.3.3
twine==1.8.1
typing_extensions @ file:///opt/conda/conda-bld/typing_extensions_1647553014482/work
urllib3==1.26.20
urwid==2.1.2
wcwidth==0.2.13
zipp @ file:///tmp/build/80754af9/zipp_1633618647012/work

name: polygraph
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - attrs=21.4.0=pyhd3eb1b0_0
  - ca-certificates=2025.2.25=h06a4308_0
  - certifi=2021.5.30=py36h06a4308_0
  - importlib-metadata=4.8.1=py36h06a4308_0
  - importlib_metadata=4.8.1=hd3eb1b0_0
  - iniconfig=1.1.1=pyhd3eb1b0_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.3=he6710b0_2
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - more-itertools=8.12.0=pyhd3eb1b0_0
  - ncurses=6.4=h6a678d5_0
  - openssl=1.1.1w=h7f8727e_0
  - packaging=21.3=pyhd3eb1b0_0
  - pip=21.2.2=py36h06a4308_0
  - pluggy=0.13.1=py36h06a4308_0
  - py=1.11.0=pyhd3eb1b0_0
  - pyparsing=3.0.4=pyhd3eb1b0_0
  - pytest=6.2.4=py36h06a4308_2
  - python=3.6.13=h12debd9_1
  - readline=8.2=h5eee18b_0
  - setuptools=58.0.4=py36h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - toml=0.10.2=pyhd3eb1b0_0
  - typing_extensions=4.1.1=pyh06a4308_0
  - wheel=0.37.1=pyhd3eb1b0_0
  - xz=5.6.4=h5eee18b_1
  - zipp=3.6.0=pyhd3eb1b0_0
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - args==0.1.0
      - autopep8==2.0.4
      - backcall==0.2.0
      - charset-normalizer==2.0.12
      - clint==0.5.1
      - decorator==5.1.1
      - flake8==2.5.5
      - graphql-core==3.2.6
      - idna==3.10
      - ipython==7.16.3
      - ipython-genutils==0.2.0
      - isort==5.10.1
      - jedi==0.17.2
      - mccabe==0.4.0
      - parso==0.7.1
      - pep8==1.7.1
      - pexpect==4.9.0
      - pickleshare==0.7.5
      - pkginfo==1.10.0
      - prompt-toolkit==3.0.36
      - ptyprocess==0.7.0
      - pudb==2017.1.2
      - pycodestyle==2.10.0
      - pyflakes==1.0.0
      - pygments==2.14.0
      - requests==2.27.1
      - requests-toolbelt==1.0.0
      - six==1.17.0
      - tomli==1.2.3
      - traitlets==4.3.3
      - twine==1.8.1
      - urllib3==1.26.20
      - urwid==2.1.2
      - wcwidth==0.2.13
prefix: /opt/conda/envs/polygraph

polygraph/types/tests/test_union.py::UnionTypeTest::test_commutativity polygraph/types/tests/test_union.py::UnionTypeTest::test_pipe_operator
polygraph/types/tests/test_union.py::UnionTypeTest::test_associativity polygraph/types/tests/test_union.py::UnionTypeTest::test_pipe_operator_with_more_than_two_types polygraph/types/tests/test_union.py::UnionValueTest::test_valid_type polygraph/types/tests/test_union.py::UnionValueTest::test_value_must_be_typed polygraph/types/tests/test_union.py::UnionValueTest::test_value_must_have_right_type
polygraph/types/basic_type.py
polygraph/types/basic_type.py