[Help-glpk] const char *

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Hello
A number of the GLPK API functions (e.g. 
lpx_read_model) take char * arguments, where 
const char * would seem more appropriate. 
 
Why is this? Is there some reason why these 
functions may modify the given string? Am I 
missing something here? It is somewhat 
irritating, because if I pass them a string 
declared const char * I get a compiler warning 
about discarding qualifiers.