displayUsing() returns original value if the returned value is 0

[meyer59]

Laravel Version: 10.37.3
Nova Version: 4.32.9
PHP Version: 8.2
Database Driver & Version: MYSQL
Operating System and Version: UNIX
Browser type and version: chrome 119.0.6045.124

Description:

I am using the displayUsing to show a computed number. So it's a basic Number field.
The issue is that when the value is 0 the it's returning the original value instead of the Number. My guess is that since the returned value is 0 the callback is treated the same as null and get the original value. Maybe we should do a strict check here to return original value only if returned value is a real NULL

Detailed steps to reproduce the issue on a fresh Nova installation:

Create a Number field with a value different than 0.
Then return 0 in the displayUsing() method. The result will not be zero but the original value

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