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# prototypes only check arg format
# i.e. (scalar/array/hash/code/glob and number of args)
...
print_string($obj); # fine
print_string(5);    # uh oh... basic numbers don't have a stringify me
+thod,
                    # yet the arg passed the prototype since 5 is a sc
+alar.

# methods don't check prototypes... at all.

...
}

print_string_bad($obj);