1 files changed, 9 insertions, 7 deletions
diff --git a/src/mongo/db/pipeline/expression_function.cpp b/src/mongo/db/pipeline/expression_function.cpp
index c53b0004b31..7bf43ffd1c9 100644
--- a/src/mongo/db/pipeline/expression_function.cpp
+++ b/src/mongo/db/pipeline/expression_function.cpp
@@ -46,16 +46,18 @@ ExpressionFunction::ExpressionFunction(ExpressionContext* const expCtx,
     expCtx->sbeCompatible = false;
 }
 
-Value ExpressionFunction::serialize(bool explain) const {
-    MutableDocument d;
-    d["body"] = Value(_funcSource);
-    d["args"] = Value(_passedArgs->serialize(explain));
-    d["lang"] = Value(_lang);
+Value ExpressionFunction::serialize(const SerializationOptions& options) const {
+    MutableDocument innerOpts(Document{{"body"_sd, options.serializeLiteral(_funcSource)},
+                                       {"args"_sd, _passedArgs->serialize(options)},
+                                       // "lang" is purposefully not treated as a literal since it
+                                       // is more of a selection of an enum
+                                       {"lang"_sd, _lang}});
+
     // This field will only be seralized when desugaring $where in $expr + $_internalJs
     if (_assignFirstArgToThis) {
-        d["_internalSetObjToThis"] = Value(_assignFirstArgToThis);
+        innerOpts["_internalSetObjToThis"] = options.serializeLiteral(_assignFirstArgToThis);
     }
-    return Value(Document{{kExpressionName, d.freezeToValue()}});
+    return Value(Document{{kExpressionName, innerOpts.freezeToValue()}});
 }
 
 void ExpressionFunction::_doAddDependencies(mongo::DepsTracker* deps) const {