Turtle/Trig serialization format

[kwisatz]

Sorry, I don't even have the proper terminology to properly ask this question.

I noticed that in rdflib 5.x, serializing to turtle (or trig) would create this shortened format:

example:4583 a crm:E21_Person ;
        crm:P100_died_in [ a crm:E69_Death ;
                crm:P4_has_time-span [ a crm:E52_Time-Span ;
                        saflux:value "1987-08-02"^^edtf:EDTF ] ] ;
        crm:P1_is_identified_by [ a crm:E41_Appellation ;
                efr:R8_consists_of [ a crm:E90_Symbolic_Object ;
                        saflux:label saflux:name ;

Whereas with version 6.3.x we now automatically get this, less human-readable format with throwaway node-ids:

example:4583 a crm:E21_Person ;
        crm:P100_died_in _:N527ded3053d54797b9fd54f8c4bc10f7 ;
        crm:P1_is_identified_by _:N00338fc27c134249bae25d3977530376 ;
        crm:P2_has_type _:Ncc7a53609d1e4ac69a2cf81a225dba01 ;
        crm:P48_has_preferred_identifier _:Na9a4d615bee84af4878df7e17ad07d74 ;
        crm:P67i_is_refered_to_by _:Ne1dee4645d3647239053e993b579a4b7 ;
        crm:P98_was_born _:N33cc2e2a29e743a2a0fcdbf8bdccb5ec .

    _:N00338fc27c134249bae25d3977530376 a crm:E41_Appellation ;
        efr:R8_consists_of _:N2e49e318dd2543168e990e19bf7c2f11 ;
        crm:P70i_is_documented_in _:N1c5f084e2d994924820fd5dbccd40b52,
            _:Ne8a09216446a41e29006a02519e7c329 .

Is there a flag to the serializer that I missed (I think I checked the documentation thoroughly) or is it just no longer possible to use the first format?