rework of the entire tree API - resolves #772

add full generic support for cx_strsplit()

add full generic support for cx_strtrim()

remove unnecessary explicit calls to cx_str() from the tests

add full generic support for cx_strstr()

add full generic support for cx_strchr() and cx_strrchr()

(0) -1000 -300 -100 -30 -10 -6 +6 +10 tip

mercurial