1. A method, comprising: receiving a font subset comprising one or more glyphs of a master font having a master ordering that establishes an order of precedence on the glyphs of the master font; in response to said receiving, repositioning in an extensible data structure at least one glyph of one or more existing glyphs already in the extensible data structure, wherein prior to said repositioning, the one or more existing glyphs are in a consecutive sequence in the extensible data structure to preserve the order of precedence established by the master ordering; and positioning each received glyph of the received font subset in the extensible data structure, wherein said repositioning and said positioning jointly establish a new consecutive sequential ordering on the glyphs of a combined font subset comprising the one or more existing glyphs and the one or more received glyphs of the received font subset, such that the new consecutive sequential ordering preserves, on the glyphs of the combined font subset, the order of precedence established by the master ordering.