review comments

Author: rvilarl

src/timesigglyph.ts

@@ -75,6 +75,8 @@ export class TimeSignatureGlyph extends Glyph {
       height = Math.max(height, botGlyph.getMetrics().height);
     }
 
+    // If the height of the digits is more than two staff spaces (20), shift to the next line
+    // in order to center the digits on lines 1 and 5 rather than 2 and 4.
     this.lineShift = height > 20 ? 1 : 0;
 
     this.width = Math.max(topWidth, botWidth);