obsmarker: crash more helpfully when metadata fields are >255bytes (issue5681)...
obsmarker: crash more helpfully when metadata fields are >255bytes (issue5681)
Various mutators fail when attempting to write obsmarkers with
metadata fields longer than 255 bytes, since the length of
mwetadata fields is stored in u8s. This change raises a more
helpful error in such circumstances.
Differential Revision:
https://phab.mercurial-scm.org/D865