[BUGFIX] Make sure to never proxy internal classes
[BUGFIX] Make sure to never proxy internal classes

Internal classes (e.g. DateTime) cannot be proxied (mostly because it is
not possible to rename them to _Original). Make sure it's never tried.

Change-Id: Ib6b2280a5266e05090a634f875ae87da05e56794
Original-Commit-Hash: 793ca816c053c4a5defc8758983c8b8507e19893

bwaidelich/flow-development-collection,kdambekalns/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,albe/flow-development-collection,gerhard-boden/flow-development-collection,mkeitsch/flow-development-collection,robertlemke/flow-development-collection,dfeyer/flow-development-collection,kdambekalns/flow-development-collection,kdambekalns/flow-development-collection,neos/flow-development-collection,daniellienert/flow-development-collection,daniellienert/flow-development-collection,neos/flow-development-collection,kitsunet/flow-development-collection,gerhard-boden/flow-development-collection,fcool/flow-development-collection,chewbakartik/flow-development-collection,mkeitsch/flow-development-collection,chewbakartik/flow-development-collection,kitsunet/flow-development-collection,robertlemke/flow-development-collection,neos/flow-development-collection,albe/flow-development-collection,robertlemke/flow-development-collection,fcool/flow-development-collection,dfeyer/flow-development-collection,aertmann/flow-development-collection,daniellienert/flow-development-collection,chewbakartik/flow-development-collection,fcool/flow-development-collection,kitsunet/flow-development-collection,dfeyer/flow-development-collection,fcool/flow-development-collection,dlubitz/flow-development-collection,albe/flow-development-collection,dlubitz/flow-development-collection,mkeitsch/flow-development-collection,robertlemke/flow-development-collection,bwaidelich/flow-development-collection,bwaidelich/flow-development-collection,neos/flow-development-collection,dlubitz/flow-development-collection,aertmann/flow-development-collection,gerhard-boden/flow-development-collection,aertmann/flow-development-collection