Strongly typed invocations can only be done on a j-typed reference.
强类型调用只能在j - typed引用上完成。
A typed reference contains a type token and an address to an object instance.
型别参考包含型别语汇基元和物件执行个体的位址。
The typed reference is popped from the stack and its corresponding type token retrieved.
型别参考是从堆叠取出，并且撷取其对应的型别语汇基元。
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