How to store float value in MongoDB - mongodb

Question

I'm using jenssegers/laravel-mongodb package (for Laravel) and I'm trying to store float values in database so I can order them but it always stores them as string. I tried using $casts attribute and I tried direct casting like $some_value = (float)$value; but it doesn't work.
Is it possible to cast the attribute while calling orderBy function, in other words, is it possible to trick Eloquent so it orders the rows as float, not as string (I attempted to fix this with mutators but still no progress).
EDIT:
This is the mutator that I use. It works ok for "int" part, but when it's float then the rate is converted to string.
I tried converting everything to float but it didn't help
public function setRateAttribute($value)
{
if(strpos($value, ".") !== false or is_float($value)) {
$this->attributes['rate'] = (float)$value;
} else {
$this->attributes['rate'] = (int)$value;
}
}
EDIT2:
$c = new \App\Contractor();
$c->rate = "1.5";
$c->save();
This is example from php artisan tinker, it's the same in application only with additional fields.
The problem is that some entries are converted to float but some are string. I can't reproduce it always, it happens randomly.
This is example response when I loop through all entries and var_dump only rate:
string(5) "16.67"
string(5) "33.33"
string(5) "24.44"
string(5) "33.33"
string(5) "33.33"
string(5) "27.78"
string(5) "27.78"
string(4) "8.89"
string(4) "6.67"
string(5) "22.22"
string(5) "16.67"
int(0)
float(1.5)
float(1.5)

Answer 1

MongoDB doesn't support float directly; it has double instead, so you can use
$some_value = (double)$value;
and you need to make sure the syntax is correct.