PeachDrawing.Text
PeachDrawing.Text.TypefaceQuery
TypefaceQuery.MustCover Property
A character the face has to be able to draw, or null for none. A face is taken to cover the
characters of its unicode-range if it has one, and otherwise the ones its cmap maps.
public System.Nullable<System.Text.Rune> MustCover { get; init; }