Adding required attribute. Causes an error

[patayko]

MappingException in MappingFactory.php line 302:
Could not add required property 0 in class App\Booking because it does not exist.

Based on the code on MappingFactory.php line 302 the keys of the array was used to conditions making the values ignored and a value 0 was tested causing an exception.

[patayko]

example:

Valid
["note" => "note",
"status" => "status",
"reservation" => "reservation",]

Cause Error
["note",
"status",
"reservation" ]