What's the difference between the parameter types?

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Maybe a silly question, but what’s the difference between these types?

  • ESuggestProjVelocityTraceOption::DoNotTrace
  • ESuggestProjVelocityTraceOption::TraceFullPath

I couldn’t find out what the differences were, as the Unreal Docs are pretty sparse for the SuggestProjectileVelocity() function. Any help would be greatly appreciated!