Allow heterogenous arrays (#92)

The 1.0.0 version of the TOML specification allows heterogenous arrays

tests/conftest.py

@@ -42,6 +42,13 @@ def _example(name):
 
 
 TEST_DIR = os.path.join(os.path.dirname(__file__), "toml-test", "tests")
+IGNORED_TESTS = {
+    "invalid": [
+        "array-mixed-types-strings-and-ints.toml",
+        "array-mixed-types-arrays-and-ints.toml",
+        "array-mixed-types-ints-and-floats.toml",
+    ]
+}
 
 
 def get_tomltest_cases():
@@ -52,8 +59,12 @@ def get_tomltest_cases():
     rv = {}
     for d in dirs:
         rv[d] = {}
+        ignored = IGNORED_TESTS.get(d, [])
         files = os.listdir(os.path.join(TEST_DIR, d))
         for f in files:
+            if f in ignored:
+                continue
+
             bn, ext = f.rsplit(".", 1)
             if bn not in rv[d]:
                 rv[d][bn] = {}

tests/test_api.py

@@ -77,7 +77,6 @@ def test_parsed_document_are_properly_json_representable(
         ("section_with_trailing_characters", UnexpectedCharError),
         ("key_value_with_trailing_chars", UnexpectedCharError),
         ("array_with_invalid_chars", UnexpectedCharError),
-        ("mixed_array_types", MixedArrayTypesError),
         ("invalid_number", InvalidNumberError),
         ("invalid_date", InvalidDateError),
         ("invalid_time", InvalidTimeError),

tomlkit/items.py

@@ -762,18 +762,6 @@ def discriminant(self):  # type: () -> int
     def value(self):  # type: () -> list
         return self
 
-    def is_homogeneous(self):  # type: () -> bool
-        if not self:
-            return True
-
-        discriminants = [
-            i.discriminant
-            for i in self._value
-            if not isinstance(i, (Whitespace, Comment))
-        ]
-
-        return len(set(discriminants)) == 1
-
     def multiline(self, multiline):  # type: (bool) -> self
         self._multiline = multiline
 
@@ -801,9 +789,6 @@ def append(self, _item):  # type: () -> None
 
         self._value.append(it)
 
-        if not self.is_homogeneous():
-            raise ValueError("Array has mixed types elements")
-
     if not PY2:
 
         def clear(self):

tomlkit/parser.py

@@ -674,10 +674,7 @@ def _parse_array(self):  # type: () -> Array
         except ValueError:
             pass
         else:
-            if res.is_homogeneous():
-                return res
-
-        raise self.parse_error(MixedArrayTypesError)
+            return res
 
     def _parse_inline_table(self):  # type: () -> InlineTable
         # consume opening bracket, EOF here is an issue (middle of array)