Confusing array filter logic

[EvitanRelta]

Currently, if the a rule's filter is an array of tag-names (ie. TagName[]), the elements are OR against each other.
eg. filter: ['b', 'strong'] is logically "element has the tag-name 'b' OR 'strong'"

But if the array contains an element of type FilterPredicate, the elements are suddenly AND against each other.
eg. filter: ['b', isStrong] is logically "element has the tag-name 'b' AND isStrong"

Also, for convenience, the rules' filters are allowed to be a single (ie. not an array) TagName or FilterPredicate type.
eg. filter: 'b' or filter: isStrong, which slightly complicates the typings and evaluation of the filters.

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A better evaluation logic would be:

• disallow just filter: TagName | FilterPredicate types (ie. only allow arrays)
• allow nested arrays where:
  • the outer array is OR logically
  • the inner array is AND logically
    (ie. [A, [B, C], D] is logically "A or (B and C) or D")