override global info instead of replace on __init__

Author: Teque5

sigmf/__init__.py

@@ -5,7 +5,7 @@
 # SPDX-License-Identifier: LGPL-3.0-or-later
 
 # version of this python module
-__version__ = "1.2.4"
+__version__ = "1.2.5"
 # matching version of the SigMF specification
 __specification__ = "1.2.0"
 

sigmf/sigmffile.py

@@ -287,9 +287,9 @@ def set_metadata(self, metadata):
 
     def set_global_info(self, new_global):
         """
-        Overwrite the global info with a new dictionary.
+        Recursively override existing global metadata with new global metadata.
         """
-        self._metadata[self.GLOBAL_KEY] = new_global.copy()
+        self._metadata[self.GLOBAL_KEY] = dict_merge(self._metadata[self.GLOBAL_KEY], new_global)
 
     def get_global_info(self):
         """