In _system_sort_requirements, the string comparison warns about two comparison values that are not a string.
Both time the values to compare are :
array (size=2) 0 => string 'cURL' (length=4) 1 => string 'cURL' (length=4)
whereas the correct string would be
string 'cURL' (length=4)
Where can I find the origin of this value to fix this?