Those functions are certainly useful and there are...

# stdlib

[mplatvoet]

Those functions are certainly useful and there are probably way more functions that are useful that are common enough for some standard lib. However, I think it's wise to keep the std lib to a bare minimum. Motivation is of course startup times, memory consumption and method counts (android limit). Would be cool if we see some standard extension libs in the future, so people can decide for themselves what to add and what not.