fix: types and tests

Author: vinitkumar

.coverage

@@ -59,7 +59,7 @@ def get_unique_id(element: str) -> str:
     float,
     bool,
     numbers.Number,
-    Sequence[str],
+    Sequence[Any],
     datetime.datetime,
     datetime.date,
     None,
@@ -97,7 +97,7 @@ def get_xml_type(val: ELEMENT) -> str:
     return type(val).__name__
 
 
-def escape_xml(s: str | numbers.Number) -> str:
+def escape_xml(s: str | int | float | numbers.Number) -> str:
     """
     Escape a string for use in XML.
 
@@ -178,7 +178,7 @@ def make_valid_xml_name(key: str, attr: dict[str, Any]) -> tuple[str, dict[str,
     return key, attr
 
 
-def wrap_cdata(s: str | numbers.Number) -> str:
+def wrap_cdata(s: str | int | float | numbers.Number) -> str:
     """Wraps a string into CDATA sections"""
     s = str(s).replace("]]>", "]]]]><![CDATA[>")
     return "<![CDATA[" + s + "]]>"
@@ -505,24 +505,32 @@ def convert_list(
 
 def convert_kv(
     key: str,
-    val: str | numbers.Number,
+    val: str | int | float | numbers.Number | datetime.datetime | datetime.date,
     attr_type: bool,
-    attr: dict[str, Any] = {},
+    attr: dict[str, Any] | None = None,
     cdata: bool = False,
 ) -> str:
-    """Converts a number or string into an XML element"""
+    """Converts a number, string, or datetime into an XML element"""
+    if attr is None:
+        attr = {}
     key, attr = make_valid_xml_name(key, attr)
 
+    # Convert datetime to isoformat string
+    if hasattr(val, "isoformat") and isinstance(val, (datetime.datetime, datetime.date)):
+        val = val.isoformat()
+
     if attr_type:
         attr["type"] = get_xml_type(val)
     attr_string = make_attrstring(attr)
     return f"<{key}{attr_string}>{wrap_cdata(val) if cdata else escape_xml(val)}</{key}>"
 
 
 def convert_bool(
-    key: str, val: bool, attr_type: bool, attr: dict[str, Any] = {}, cdata: bool = False
+    key: str, val: bool, attr_type: bool, attr: dict[str, Any] | None = None, cdata: bool = False
 ) -> str:
     """Converts a boolean into an XML element"""
+    if attr is None:
+        attr = {}
     key, attr = make_valid_xml_name(key, attr)
 
     if attr_type:
@@ -532,9 +540,11 @@ def convert_bool(
 
 
 def convert_none(
-    key: str, attr_type: bool, attr: dict[str, Any] = {}, cdata: bool = False
+    key: str, attr_type: bool, attr: dict[str, Any] | None = None, cdata: bool = False
 ) -> str:
     """Converts a null value into an XML element"""
+    if attr is None:
+        attr = {}
     key, attr = make_valid_xml_name(key, attr)
 
     if attr_type:
@@ -544,7 +554,7 @@ def convert_none(
 
 
 def dicttoxml(
-    obj: dict[str, Any],
+    obj: ELEMENT,
     root: bool = True,
     custom_root: str = "root",
     ids: list[int] | None = None,