Multiple packages use the same patch throw an array to string exception

[deviantintegral]

If I set up package A with a patch, and package B with the same patch, and set package A to require B, the URLs are merged into an array. This causes composer install to bail with an array to string conversion.

[cweagans]

Good find! That's definitely not the desired behavior :)

[grasmash]

This is caused by $this->patches = array_merge_recursive($this->patches, $extra['patches']);
in Patches.php.

[lacun]

Hello,
On a project, the array to string conversion problem occurs when calling composer install with already installed patches.
It's caused by the remaining call to $this->patches = array_merge_recursive($this->patches, $extra['patches']);