• SVG: keep empty attributes; fixes #576
• JS: use literal NULL instead of escaped zero in strings, fixes #577
• JS: fix parsing of string expressions at the start of statement lists that are no UseStrictDirectives
• JS: decode unicode escape sequences in strings to UTF-8 literals
• JS: fix unicode string escape when not a valid UTF-8 character
• HTML: do not convert lang attribute value to lower #579
• JS: fix race condition for ECMAScript version and remove deprecated NoNullishOperator (use Version instead), fixes https://github.com/tdewolff/minify/issues/582