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Setting the config has no problem. Only reading has.
The config is read from Tk at line 1270 by code
 res = self.tk.call('grid',
 command, self._w, index)
. If each of the four options (minsize, pad, uniform, and weight) has been set to value 1, |res|'s value after the tk call would be a tuple |('-minsize', 1, '-pad', 1, '-uniform', '1', '-weight', 1)|. This explains why |uniform|'s value does not cause problem, because it is a str, while the other three's are int. Also int 0 does not cause problem because it is handled at line 1277 by code
 if not value:
 value = None
so the resulting option value appears as None in rowconfigure or columnconfigure's resulting dict.
In my speculation, the bug is that, when converting from the tuple returned by tk call into the resulting dict to be returned by rowconfigure or columnconfigure, the converting code assumes that the option values in the tuple returned by tk call are all str. But somehow only |uniform|'s value is str, while other three's are int.