[BUGFIX] Prevent php warning when passing array as tag attribute #858
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TagBuilder::addAttribute() allows both strings and array/traversables as attribute value. However, in the implementation only "data" and "aria" are properly handled as arrays. For other attribute names, this leads to a type conversion warning.
With this patch, that edge case is properly handled with an exception. Also, test coverage is added both for data/aria and the exception.
Resolves: #857