I'm trying to optimize my node app with --trace-deopt

how do i see why the method is deopted? for example here:

**** DEOPT: Wlbl.Checker.checkUrl at bailout #24, address 0x0, frame size 88
[deoptimizing: begin 0x25d8e5e85e71 Wlbl.Checker.checkUrl @24]
  translating Wlbl.Checker.checkUrl => node=260, height=40

also when i log optimizer bailouts, i see this: 
Bailout in HGraphBuilder: @"exports.paramsToString": ForInStatement is not 
fast case

does that mean i should replace the for in with a for loop that iterates 
over Object.keys?

thanks
 chris

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