Plural for me.
For all the reasons given above and because the agreed conventions where I work (that I contributed to creating) require plurals for arrays / lists / vectors etc.
Although plural naming can cause some anomalies in some cases the majority case is that it provides enhanced clarity and code that is easier to scan read without that annoying feeling of your mind catching on a strange construction and interrupting the flow while you go back to unsnag your brain from whatever tripped it up.
