0.06 2021-03-21 - add de, destr function. 0.05 2020-08-30 - Improve documentation. 0.04 2020-03-21 - add dustr, dwstr, dnstr function. This function logic is move from du, dw, dn. 0.03 2020-02-21 - fix a test. 0.02 2019-12-21 - sort data keys in du, dw output. - remove "$VAR1 = " from du, dw output. - remove no needed indent. indent width become 2. - add warnings line number and file name to du, dw output. - add dn function. This function is similar as du, dw, but don't encode data. - don't send __WARN__ signal. only print dump data to STDERR. 0.01 2019-11-09 - First release.