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The first attempted fix for long build times with Xcode 15 was causing a compiler crash.

The refactor to remove concept Representation seemed to cause an unexplained long build time for Xcode 15 building Kalman filter examples. Reverting the changes to concept RepresentationOf in Xcode 15 seems to resolve the long build times. I'm not sure if we should revert this change just for Xcode 15 or in general.

This reverts commit 7d340d9.

This fix was causing the following error:

```
fatal error: error in backend: SmallVector unable to grow.
```
For some reason this new implementation of `RepresentationOf` was
causing long build times again in the Kalman fiter examples.  I'm not
sure why this is and if we should keep the old implemention only for
Xcode 15 or if we should revert this implementation change in general.
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@mpusz mpusz left a comment

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Thanks!

@mpusz mpusz merged commit 40f7f70 into mpusz:master Apr 22, 2025
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@rothmichaels rothmichaels deleted the bugfix/xcode-build branch April 22, 2025 14:20
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2 participants