Reproduces on Mac and Windows10

To reproduce:
1. Open user's attached project "618586-BlendShapes.zip"
2. In project window, find "2017 Male" FBX
3. In Inspector window, make sure the FBX settings are set as following: "Normals: Import", "Blend Shape Normal: Import"
4. In project root folder, go to "/Library/metadata/af/ and check the size of "af41c0bf58c294a46929fdba0cace4d3"

Expected: metadata files with imported BlendShapes and normals have similar sizes to the rest of the settings variations
Actual: metadata files with imported BlendShapes and normals have are significantly larger in size (2x)

Reproduced in: 2018.3.0a1, 2018.3.7f1, 2019.1.0b4, 2019.2.0a6
Not reproduced in: 2017.4.21f1

Note1: does not reproduce on LTS as the separate feature for BlendShapes was not present
Note2: other combinations of BlendShapes and Normals produce similar to each other results: 60-70 mb sized meta file