TextInput default = object?

Hi, I want to set a default value in my Input.

Example:

TextInput::make('')
  ->label('Test')
  ->default('Hi Discord.')
  ->readOnly()

TextInput::make('')
  ->label('Test')
  ->default('Hi Discord.')
  ->readOnly()

TextInput::make('')
  ->label('Test')
  ->default('Hi Discord.')
  ->readOnly()

TextInput::make('')
  ->label('Test')
  ->default('Hi Discord.')
  ->readOnly()

But the input value is [object Object]