Anyone know where I can find info on class constructors/destructors.

Anyone know where I can find info on class constructors/destructors. It seems that class destructors never run when used in runtime packages, at least that's what I'm seeing. Wondering if that's as designed, or a known issue? Any references? The help wiki doesn't say much - http://docwiki.embarcadero.com/RADStudio/Seattle/en/Methods

I'm trying to clean up my shutdown code so I can see the wood for the trees in the fastmm leak reports.