Warning about player defeated animation blending String types

[wjt]

Affected scene

Any scene that uses the Player scene

Description

W 0:00:00:897   _update_caches: AnimationMixer (at: player.tscn): 'defeated', Value Track: 'PlayerSprite:animation' blends String types. This is an experimental algorithm.
  <C++ Source>  scene/animation/animation_mixer.cpp:944 @ _update_caches()

This warning appears whenever one plays the game. It's harmless, but harmless warnings tend to desensitise us to other warnings which may not be harmless. If we eliminated this warning, we would (theoretically!) be able to have an automated test that (e.g.) Fray's End loads without warnings.