around word does not select prior separator characters.

[1wsx10]

consider the scenario:
return true;

your cursor is somewhere on true and you use vaw.
default vim selects true and the prior space, this plugin just selects true.

it seems like you get this right in some scenarios, eg:
return true
here the space will be selected.

it happens with other delimiters than spaces too:
return my_var;
if your cursor is on var, it won't select the underscore.
return my_var
but do the same on this line, and the underscore is selected.