I'm not sure whether it is a bug or feature
at least I couldn't find this behavior documented:
When I divide a Tag (I have the following separator: !--! )
all the resulting separate tags are trimmed as with the $trim(x) command
This behavior doesn't bother me
(but I could think of scenarios where it might bother somebody)
but I think if it is on purpose it should be mentioned in the
description of the action.