Question How to find type in serialization of object references

I'm looking at potentially writing asset references directly to file and i can't seem to find information about the type number that shows up in the following:

Code (CSharp):

1.   - {fileID: 2800000, guid: 2c21bf9c930f2af43b5a9e2c16b8ec4b, type: 3}
2.   - {fileID: 11400000, guid: 95148f1d2db534f8b81fbd19ea806575, type: 2}

I havent seen anything other than 2 or 3 and it seems to roughly correspond to:
UnityEngine.Object 2 (Texture, ScriptableObject etc)
MonoBehavior 3
Prefab 3

Does anyone have more information about how i could reliably generate this number? preferably just using path, fileID, guid, and System.Type. Thanks!