Unity crashes when the FBX model scale factor set to value having 20 digits or above.

Steps to Repro:
1. Create a new project.
2. Download and import any FBX.
3. Select fbx model in the project view.
4. In the inspector, go to Model Tab.
5. Change the Scale factor in the inspector to any number having 20 digits or above.

Actual Result:
Editor Crashes.

Expected Result:
Unity should be able to handle different values.

Environment:
Windows and Mac

Occurring with:
2019.1.0a1, 2018.3.0b2, 2018.3.0a11, 2018.3.0a9, 2018.3.0a8

Working Fine with:
2018.3.0a7, 2018.3.0a5, 2018.2.0f2, 2017.2.0f3