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===with tables=== {{code|lang=lua|Buffer .. table}} {{code|lang=lua|table .. Buffer}} The same general operation applies for tables as with non-tables{{--}}i.e., [[#valid|validated]] values are inserted left-to-right into a new table to be joined by table.concat. In fact, tables which have a metatable (including Buffer objects which are not an Element-Buffer) are forwarded to Buffer:_ and processed the same way as non-tables. Given a <code>table</code> for which {{luaref|getmetatable||y}} returns nil or false, this instead forwards the table to {{luaself|:_all}}, which iterates every value indexed at a number key in sequential order, inserting those which are valid in the new table. As a reminder, Buffer:_ validates tables with metatables that lack a __tostring method through table.concat, which throws an error on sequences containing one or more value that is neither a string nor a number. Such accounts for nearly all cases of breaking errors involving this op. Note that the ''valKey'' parameter of Buffer:_all is not triggered.
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