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...using its own private copy of the global r-registers. That is, the global registers are saved before <expression> is evaluated and restored afterwards. This allows the <expression> to alter the r-registers without affecting the softcode outside the localize() invocation. ...

...This means that functions "below" the level of the u() can reset [[global registers]] for temporary calculations, without needing to worry about "clobbering" t ...seful for global or shared code which calls arbitrary u() functions, where global register values need to be preserved from accidental user clobbering. ...