Handling of NULL at LocalVariablesSorter.visitFrame()

Hello,

in version 3.3 the method LocalVariablesSorter.visitFrame() was updated to
include the check of locals types. It checks for Integer, Float, Long, Double
and otherwise use the following:
typ = Type.getObjectType((String) t);

I have the problem with this statement. If local value is Opcodes.NULL then
we have ClassCastException (java.lang.Integer cannot be cast to
java.lang.String).
Probably the reason is that I use LocalVariablesSorter delegating to
AnalyzerAdapter, which pushes Opcodes.NULL on stack in case of ACONST_NULL
instruction.

It's not reproducible with ASM 3.2.

Could you please let me know if it's really an issue in ASM or just incorrect
using of ASM by me?

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