[ttLib] meta table should allow multiple records for some tags

[moyogo]

The OpenType 1.8.4 Meta table mentions:

If only one record or value is permitted for a tag, then any instances after the first may be ignored.

So some tags may permit only one record and others may permit multiple records.

FontTools currently stores the data as a dictionary, which only permits one record per tag.

[schriftgestalt]

I was about to report this, too. And for round-tripping it would be good to be able to store the order of the elements.

[benkiel]

Are there any tags that allow multiple records? Looking at the spec, the two defined tags do not.

[schriftgestalt]

The spec explicitly mentions what to do when there are more than one. So even if there are no defined tags that allow it, it seems that it is allowed. And fontTools should preserve them even if it is not useful right now.