EncodingError raised when server returns invalid UTF-8 in error messages derived from user input

class MyDocument

  include Mongoid::Document

  field :name, type: String

  index({name: 1}, {unique: true})

end

MyDocument.create_indexes

MyDocument.collection.insert_one({name: "(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻"})

# this raises

# EncodingError (String E11000 duplicate key error collection: my_db.my_documents index: name_1 dup key: { : "(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□?..." } is not valid UTF-8: bogus high bits for continuation byte)

# the truncation fell in the middle of a ° character

MyDocument.collection.insert_one({name: "(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻"})

MyDocument.collection.insert_one({name: "a(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻"})

# this raises

# Mongo::Error::OperationFailure (E11000 duplicate key error collection: my_db.my_documents index: name_1 dup key: { : "a(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□..." } (11000) (on 127.0.0.1:27017, legacy retry, attempt 1))

# which is expected

MyDocument.collection.insert_one({name: "a(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻(╯°□°)╯︵ ┻━┻"})