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Can't use direction names in (case)

From: Dan Eble
Subject: Can't use direction names in (case)
Date: Sun, 12 Jun 2022 07:03:03 -0400 
This not do what I intended:

```
  (case (ly:item-break-dir grob)
    ((LEFT) (ly:grob-property grob 'glyph-left))
    ((RIGHT) (ly:grob-property grob 'glyph-right))
    (else (ly:grob-property grob 'glyph))))
```

This does:

```
  (case (ly:item-break-dir grob)
    ((-1) (ly:grob-property grob 'glyph-left))
    ((1) (ly:grob-property grob 'glyph-right))
    (else (ly:grob-property grob 'glyph))))
```

Why?
— 
Dan
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