" If many of the values in the field are the same, the index might not significantly speed up queries."
"An index on the gender column likely would not help because there's no value in an index on a low cardinality column. Meaning, there's not enough variety in the values for the index to provide any value."
an index on a low cardinality column is generally not recommended as mentioned above. So is there any difference in ObjectDB?
There's never been infinity. Cantor's diagonal proof is completely wrong.