Blame README_d/README.hacking

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* Use one of the following macros to access the value of a numeric NODE:
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	Macro                   Returned C type
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	---------------------------------------
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	get_number_ui(n)        unsigned long
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	get_number_si(n)        long
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	get_number_d(n)		double	
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	get_number_uj(n)	uintmax_t
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* Use iszero(n) to test if a numeric NODE is zero.