Why do you think that a language with better details would prevent you from opting in to whatever non-default behavior you need? Having the "right" defaults is

Why do you think that a language with better details would prevent you from opting in to whatever non-default behavior you need? Having the "right" defaults is better for everyone. Folks who don't know or care get a good, safe default with no undefined behavior or unexpected danger, and folks who know better can opt into something that fits their needs explicitly. Seems ideal to me.