## Generic-function: SB-SEQUENCE:MAP
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> Implements CL:MAP for extended sequences.
> 
> RESULT-PROTOTYPE corresponds to the RESULT-TYPE of CL:MAP but
> receives a prototype instance of an extended sequence class
> instead of a type specifier. By dispatching on RESULT-PROTOTYPE,
> methods on this generic function specify how extended sequence
> classes act when they are specified as the result type in a CL:MAP
> call. RESULT-PROTOTYPE may not be fully initialized and thus
> should only be used for dispatch and to determine its class.
> 
> Another difference to CL:MAP is that FUNCTION is a function, not a
> function designator.

### Lambda list
```cl
(sb-impl::result-prototype function sequence &rest sb-impl::sequences)
```