Determines if value1 and value2 can be non-trivially unioned.
Any two values can be trivially unioned by adding both of them to a GstValueList. However, certain types have the possibility to be
unioned in a simpler way. For example, an integer range and an integer can be unioned if the integer is a subset of the integer range. If
there is the possibility that two values can be unioned, this function returns true.
| value1 |
a value to union |
| value2 |
another value to union |
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