Items with the same list of characteristics but different stats stack inappropriately

This is more a collection of bugs with probably the same root cause. If an item has the same list of characteristics (and maybe the same material in parenthesis in the item name) but different stats then they will stack improperly in a number of areas.

For example, if 2 stone powders are made, one from a marble/marble hybrid stone, and one from a marble stone block, they will both have just marble in the characteristics section, but have 8% and 4% crit respectively.

The following interactions occur:
1) If both items are placed into the same inventory, the item placed last will turn into the item in the target inventory and stack into them
2) Food consumed will overwrite a previous food instead of stacking
3) Items in 2 different inventories that are queried for crafting will be treated as a single stack of one or the other item type