ReferenceData modelShared primitivesPitchCallDescriptionSource-reported pitch result/call label, such as MLB's `Ball`.scalarstringUsed by←PitchView.call_description←previousPitchCallCodenext→PitcherRefPitchCallCodeSource-reported compact pitch result/call code, such as MLB's `B`.PitcherRefA probable starting pitcher on a [`MatchupCard`] — nullable end to end