Merges copies of @value1 and @value2. Values that are not
of type #GST_TYPE_LIST are treated as if they were lists of length 1.
The result will be put into @dest and will either be a list that will not
contain any duplicates, or a non-list type (if @value1 and @value2
were equal).
Merges copies of @value1 and @value2. Values that are not of type #GST_TYPE_LIST are treated as if they were lists of length 1.
The result will be put into @dest and will either be a list that will not contain any duplicates, or a non-list type (if @value1 and @value2 were equal).