request: graph_diff behavior

When I use `graph_diff` it tells me that these two objects are different:

`rdflib.term.Literal('R06AA56', datatype=rdflib.term.URIRef('http://www.w3.org/2001/XMLSchema#string'))`
`rdflib.term.Literal('R06AA56')`

Is there an option for me to tell `graph_diff` to consider them being identical? I'm not sure how to strip the datatype from the first of those two objects.

Thank you.