How to select documents from mongodb where value is in given range?

Question

JavaScript

{ $gte: 6, $lte: 8 };
does not work, apparently because the values ​​are stored in the database as strings
in this case, it gives me documents that start with "6" or "7", for example: "6990", "61990", "7290"
What is better to do in such situation? Perhaps there is a function that will compose a regular expression? or what is faster

Answer 1

And it doesn't roll?
Or would it be easier to write string to number

Answer 2

According to the idea, it should not work, if I'm not mistaken, it should be something like: or
{$and:[{field:{$gte: 6}}, {field:{$lte: 8}}]}