The `BKE_fcurve_bezt_shrink()` function had an artificial limitation to only allow shrinking the `bezt` array. That limitation is now removed, and therefore the function renamed to `BKE_fcurve_bezt_resize()`. A note was added to the documentation that newly added array elements should be initialized by the caller. Pull Request: https://projects.blender.org/blender/blender/pulls/134864