Data structure used by the duplicator to store and load entity data.
It also shows up in several other contexts:
The entity's position, relative to the duplication origin point.
The entity's angle, relative to the duplication angle.
The entity's model scale, see Entity:GetModelScale. This will only be present if the model scale isn't 1.
Each flex bone's flex weight, see Entity:GetFlexWeight. The key is the flex's index and the value is the weight. Only flexes with a non-default (nonzero) weight are listed, and if none exist, this field will be nil.
The entity's body groups, see Entity:GetBodygroup. The key is the bodygroup ID and the value is the assigned bodygroup number. Only body groups with a non-default (> 0) value are listed, and if none exist, this field will be nil.
The entity's MapCreationID, only exists for entities that were created by the map. See Entity:MapCreationID.