No ColdFusion Len Member Function on Java numbers

len-test.cfm

<cfscript>
    myNumber = 10;
    writeOutput( myNumber.len() );

    //This will throw a "The len method was not found"
    myJavaNumber = JavaCast( "int", myNumber );
    writeOutput( myJavaNumber.len() );
    
    //This will throw a "The len method was not found"
    myQueryNumber = queryNew( "id", "integer", {id: 16} ).id;
    writeDump( myQueryNumber.len() );
</cfscript>