Convert defaults to their expected types

Fixes problems in reading conf values before the configuration
is fully initialized.

tests/test_conf.py

@@ -0,0 +1,44 @@
+import importlib
+import unittest
+
+import osc.conf
+
+
+class TestConf(unittest.TestCase):
+    def setUp(self):
+        # reset the global `config` in preparation for running the tests
+        importlib.reload(osc.conf)
+
+    def tearDown(self):
+        # reset the global `config` to avoid impacting tests from other classes
+        importlib.reload(osc.conf)
+
+    def test_bool_opts_defaults(self):
+        opts = osc.conf.boolean_opts
+        config = osc.conf.config
+        for opt in opts:
+            self.assertIsInstance(config[opt], bool, msg=f"option: '{opt}'")
+
+    def test_int_opts_defaults(self):
+        opts = osc.conf.integer_opts
+        config = osc.conf.config
+        for opt in opts:
+            self.assertIsInstance(config[opt], int, msg=f"option: '{opt}'")
+
+    def test_bool_opts(self):
+        osc.conf.get_config()
+        opts = osc.conf.boolean_opts
+        config = osc.conf.config
+        for opt in opts:
+            self.assertIsInstance(config[opt], bool, msg=f"option: '{opt}'")
+
+    def test_int_opts(self):
+        osc.conf.get_config()
+        opts = osc.conf.integer_opts
+        config = osc.conf.config
+        for opt in opts:
+            self.assertIsInstance(config[opt], int, msg=f"option: '{opt}'")
+
+
+if __name__ == "__main__":
+    unittest.main()