At present, it appears nothing in FontAnvil is capable of setting the version number of the "gasp" table, which controls grid fitting in TrueType. It will preserve the version number of a table in a loaded font, and code I am checking in now will automatically set it to "1" (usually the preferred value) when entries are created that require version 1; otherwise it seems to default to 0 though I can't even find the code that sets that. Ideally, there would be a (probably FontAnvil-specific) function or standard variable to allow access to this.
mskala 
Tsukurimashou Font Family and IDSgrep
At present, it appears nothing in FontAnvil is capable of setting the version number of the "gasp" table, which controls grid fitting in TrueType. It will preserve the version number of a table in a loaded font, and code I am checking in now will automatically set it to "1" (usually the preferred value) when entries are created that require version 1; otherwise it seems to default to 0 though I can't even find the code that sets that. Ideally, there would be a (probably FontAnvil-specific) function or standard variable to allow access to this.