Replace `@assert` with `throw`

[eliascarv]

Motivation: @assert docstring:

help?> @assert
  @assert cond [text]

  Throw an AssertionError if cond is false. Preferred syntax for writing
  assertions. Message text is optionally displayed upon assertion failure.

  │ Warning
  │
  │  An assert might be disabled at various optimization levels. Assert
  │  should therefore only be used as a debugging tool and not used for
  │  authentication verification (e.g., verifying passwords), nor should
  │  side effects needed for the function to work correctly be used
  │  inside of asserts.