feat: Reflect explicitly XSD-typed Literals in JSON-LD serialization

Supplying an XSD type argument to the rdflib.Literal datatype
parameter should be reflected in JSON-LD serializations.

Closes: RDFLib#2812

Author: lu-pl

rdflib/plugins/serializers/jsonld.py

@@ -36,16 +36,15 @@
 # graphs.
 
 from __future__ import annotations
-
+from typing import Any, Dict, IO, List, Optional
 import warnings
-from typing import IO, Any, Dict, List, Optional
 
 from rdflib.graph import DATASET_DEFAULT_GRAPH_ID, Graph, _ObjectType
 from rdflib.namespace import RDF, XSD
 from rdflib.serializer import Serializer
 from rdflib.term import BNode, IdentifiedNode, Identifier, Literal, URIRef
 
-from ..shared.jsonld.context import UNDEF, Context
+from ..shared.jsonld.context import Context, UNDEF
 from ..shared.jsonld.keys import CONTEXT, GRAPH, ID, LANG, LIST, SET, VOCAB
 from ..shared.jsonld.util import _HAS_ORJSON, json, orjson
 
@@ -393,11 +392,8 @@ def to_raw_value(
             else:
                 v = str(o)
             if o.datatype:
-                if native:
-                    if self.context.active:
-                        return v
-                    else:
-                        return {context.value_key: v}
+                if native and self.context.active:
+                    return v
                 return {
                     context.type_key: context.to_symbol(o.datatype),
                     context.value_key: v,