? uncertain ~ approximate % uncertain and approximate YYYY-MM-DD? YYYY-MM-DD~ YYYY-MM-DD% Interesting and perhaps useful. Databases have had null

? uncertain ~ approximate % uncertain and approximate YYYY-MM-DD? YYYY-MM-DD~ YYYY-MM-DD% Interesting and perhaps useful. Databases have had null for "I don't know", but we don't have halfway between "I don't know" and "it was 1985-12-23 for sure." But couldn't the same thing be useful for other data types, like integers? "I think it was about 7 oranges." Or even strings. "I think his name was Bill." 7~ Bill?