What's the problem with non-valid attributes? A web browser that doesn't recognise an attribute will ignore it - exactly what you want.
In a word, "validation". A web-developer doesn't want to validate a document and skip 43 "invalid attribute" warnings.
Also you might want to use XHTML, where invalid code would choke an XML Parser or an XSLT transformation entirely.
My point about Seamstress is that it uses valid attributes, that is, the "ID" attribute, to do the same thing. Unless I totally missed the point in my quick look.
($_='kkvvttuubbooppuuiiffssqqffssmmiibbddllffss')
=~y~b-v~a-z~s; print
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