Attribute value containing forward slash breaks parsing

[askonomm]

A HTML string such as:

<meta name=\"route-pattern\" content=\"/:user_id/:repository\" data-turbo-transient>

Breaks the parser with:

Execution error (ClassCastException) at dompa.coordinates/normalize-html-attr-str (REPL:200).
class java.lang.Character cannot be cast to class java.lang.String (java.lang.Character and java.lang.String are in module java.base of loader 'bootstrap')