Avoid hash mismatch by stringify bindings

[erikn69]

When using \Illuminate\Foundation\Http\Middleware\ConvertEmptyStringsToNull
Bindings like

array:3 [
 0 => ""
 1 => ""
 2 => "" 
]

transform into

array:3 [
 0 => null
 1 => null
 2 => null 
]

Therefore, the hashes do not match, and you cannot use explain or run the query.