Re: [COMMITTED] pkl, testsuite, doc: defunit, support for arbitrary named units

[Alfred M. Szmidt]

I think following the lead of GNU Coreutils would be wise here
(https://www.gnu.org/software/coreutils/manual/html_node/Block-size.html):

defunit kB      = 10 ** 3;
# `K' is special: the SI prefix is `k' and the ISO/IEC 80000-13 prefix
# is `Ki', but tradition and POSIX use `k' to mean `KiB'.
defunit k       = 2 ** 10;
defunit K       = 2 ** 10;
defunit KiB     = 2 ** 10;
defunit MB      = 10 ** 6;
defunit M       = 2 ** 20;
defunit MiB     = 2 ** 20;
defunit GB      = 10 ** 9;
defunit G       = 2 ** 30;
defunit GiB     = 2 ** 30;
defunit TB      = 10 ** 12;
defunit T       = 2 ** 40;
defunit TiB     = 2 ** 40;
defunit PB      = 10 ** 15;
defunit P       = 2 ** 50;
defunit PiB     = 2 ** 50;
defunit EB      = 10 ** 18;
defunit E       = 2 ** 60;
defunit EiB     = 2 ** 60;
defunit ZB      = 10 ** 21;
defunit Z       = 2 ** 70;
defunit ZiB     = 2 ** 70;
defunit YB      = 10 ** 24;
defunit Y       = 2 ** 80;
defunit YiB     = 2 ** 80;