I would suggest that you use Thinning applications , which means that you create for several processor architectures, but only the architecture code of the installation device is used when installing the application. It is designed to reduce the size of the application on the device.
Stripping is performed in the App Store, so if you install through Crashlytics, you bypass the App Store and the uninstall does not, therefore, the difference in the size of the installation.
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