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Returns true if sym starts with one of the prefixes given. Each of the prefixes should be a String or a Regexp.
:hello.start_with?("hell")               #=> true
:hello.start_with?(/H/i)                 #=> true

# returns true if one of the prefixes matches.
:hello.start_with?("heaven", "hell")     #=> true
:hello.start_with?("heaven", "paradise") #=> false
               static VALUE
sym_start_with(int argc, VALUE *argv, VALUE sym)
    return rb_str_start_with(argc, argv, rb_sym2str(sym));

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