Sequence item del vs. delete?

[Neodim]

hello,

just faced curious issue: 
    
    
    var a = @[1,2,3,4,5]
    
    a.delete(0)
    
    echo a # returns @[2, 3, 4, 5] as expected
    
    
    Run

while 
    
    
    var a = @[1,2,3,4,5]
    a.del(0)
    echo a # returns @[5, 2, 3, 4] which is little bit confusing
    
    
    Run

Just curious is it a bug or feature?