The following sed command can be used to update TTX sources for the LookupType
change:
$ sed -i'~' 's/<!-- LookupType=\(.\) -->/<LookupType value="\1"\/>/g' *.ttx
Before this change, the `script` statement had inherited global
defaults. After this change, it overrides them. The new behavior
matches the behavior of makeotf v2.0.90.
Resolves https://github.com/behdad/fonttools/issues/505.
For the test case of https://github.com/behdad/fonttools/issues/501,
which was about an unrelated problem, feaLib now produces the exact
same output as makeotf v2.0.90.