this behaviour means that the untie happens almost immediately after the tie, i.e. the potential for possible ugly side effects is practically zero.
My benchmarks show attributes are much slower than a (&;@) sub, especially for short lists (many thousand times). 
($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,

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In reply to Re^7: Declaring with my, assigning, and testing in same line (attributes) by choroba
in thread Declaring with my, assigning, and testing in same line by mordibity

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