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				@@ -399,7 +399,7 @@ proto.serializeSortKey = function serializeSortKey(explain) { 
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				 klass.createFromJson = function createFromJson(elem, expCtx) { 
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				 	if (typeof elem !== "object") throw new Error("code 15973; the " + klass.sortName + " key specification must be an object"); 
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				-	return this.create(expCtx, elem); 
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				+	return class.create(expCtx, elem); 
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				 }; 
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				 /** 
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