100644 blob fe36863dc1f7e85fb6c628d5aec3e47a7fefef40	characters.dart
100644 blob e8694339f911cd905ae8f95829cd86af8611b727	characters_impl.dart
100644 blob b661dafcf1c3df2bc743d8d864cd651283c1d71c	extensions.dart
040000 tree c091ab1d8b229b225e658663b26050477132dc8a	grapheme_clusters