Idk what I feel about they choosing 6 (which upside down becomes 9) for 'g', instead of 9 (becoming 6) for G.

If we look at the translation table we see that most of them can be interpreted as both major and minor caps, while only 4h is locked to lower caps, and 3E, 7L, and 8B is locked to upper.

I guess 6g kind of brings a balance, but I would prefer 'it's all caps, except 4 which we try to ignore'.

0O: both caps

1I: both caps

2Z: both caps

3E: upper

4h: lower

5S: both caps

6g: lower

7L: upper

8B: upper