I'm writing some powershell at the moment, after a few weeks of work I realized that sometimes my return types for some functions would change even though I exp

I'm writing some powershell at the moment, after a few weeks of work I realized that sometimes my return types for some functions would change even though I explicitely declare them (for exemple a 'hashtable' would become a 'System Object[]' which is short for 'table full of garbage'). Turns out some ops without assignment and some printed messages would go into the pipeline (as in, to be piped in with `|`) and become part of the return value of the functions ; to make that work powershell changes the return type, appends the message or the non-assigned op to the hashtable and returns that as an object table. To this day I'm not aware of any language doing this kind of thing, but maybe js does ? Anyway I fear I'm going to get some grey hair because of that.