"Undefined array key 1" when given large single trim parameter

[jordanade]

This filename:
Hnr4t2QO4ugMstGTejDqUAkSyBXF2GlQozIjfs76-_x138-resize-trim(66218942676).png
generated this error:
Undefined array key 1
on this line:
line 109: list($x1, $y1, $x2, $y2) = $coords;
in this file:
/vendor/bkwld/croppa/src/Image.php

For these kinds of invalid or out-of-range inputs, can we return, say, 422 Unprocessable Entity?

[sdebacker]

Feel free to make a PR, with tests.