• [glyf] Add __iter__, items and values methods to the glyf table to make it more dict-like (#4156).
• [feaLib] Escape the anonymous block tag when scanning for its terminator, so tags containing regex metacharacters are matched literally (#4167).
• [varLib] Strip directory components from <variable-font name="..."/> when deriving the output filename in the varLib command line, so a designspace cannot write outside the output directory (#4168).
• [feaLib] Fix tracking of the current script and language across redundant script statements. Rules following a script statement that names the first declared language system no longer end up under the DFLT script, and a script statement naming the already-current script still narrows the language systems and terminates the current lookup while leaving the lookupflag alone, matching makeotf (#1824, #2522, #4169).
• [varLib.interpolatable] Escape glyph names in the HTML report (#4172).
• [otlLib] Fix overflow handling when building contextual lookups: offset overflows now raise OTLOffsetOverflowError instead of AttributeError so another contextual format can be tried (regression from #3439). When all formats overflow, split the ruleset in halves until it fits (#4171).