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null , returns "" .
For strings, numbers, booleans, characters returns the usual literal string representation.
For instances of hypertext objects, returns their normal html representation,
i.e. "<b>xxx</b>" for a bold tag.
For vectors and supervectors, returns a string of the concatenation of the result of
to_htm being called on each of the items in the vector.
For other objects prints "". In particular, a regular object,
even if it has a content, is printed as "".
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