Internal Error (overlap) for some fonts when running make

[James]

Hello,

Now that Dan has made default make commands 'terser' I am noticing while 
building our fonts that I see quite a few 'errors' that look like this:

Internal Error (overlap) in clefs.petrucci.c5_change: Winding number did 
not return to 0 when x=25.9951
Internal Error (overlap) in clefs.petrucci.c5_change: monotonic is both 
needed and unneeded (22.1885,310.434)->(25.9951,304.135). x=25.9951 
(prev=8.40259)

Of course they have 'always' (probably) been there - I don't want to 
claim anything like a regression.

But do we need to care?

James