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Bytecode: LOOKUPSWITCH and TABLESWITCH

I am currently instrumenting bytecode using BCEL. In the BCEL API, the two instructions types LOOKUPSWITCH and TABLESWITCH (package org.apache.bcel.generic) are implementing interface StackProducer. I know that these two instructions pop the operand stack (i.e. consume it) and do not produce anything on the stack, so how come they implement StackProducer instead of StackConsumer? Is this a bug? Thank you

(ps: I tried to post this question on the BCEL mailing list with no answer. I hope I'll find more luck here)

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