• [ttCollection] Fixed 'ResourceWarning: unclosed file' warning (#2549).
• [varLib.merger] Handle merging SinglePos with valueformat=0 (#2550).
• [ttFont] Update glyf's glyphOrder when calling TTFont.setGlyphOrder() (#2544).
• [ttFont] Added ensureDecompiled method to load all tables irrespective of the lazy attribute (#2551).
• [otBase] Added iterSubTable method to iterate over BaseTable's children of type BaseTable; useful for traversing a tree of otTables (#2551).