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#1798 Difference between opcodes in AS3
What's difference between pushint null and pushint 0? pushnull — var name:int = null pushint null — var name:int = 0 pushint 0 — var name:int = 0
pushnull pushes value "null" on stack pushint generally searches values in the abcs int table, pushint null means pushint  - the value at index 0 in the int table, it's usually zero. Did you see this case somewhere? I think it's pretty unusual. pushint 0 means really push the value 0, wherever it is in the int table. You can see tables of ints in the leftbottom section of the UI on the "Constants" tab.