</p>

<pre>
type (
	A1 = string
	A2 = A1
)

type (
	B1 string
	B2 B1
	B3 []B1
	B4 B3
)

func f[P any](x P) { … }
</pre>

<p>
The underlying type of <code>string</code>, <code>A1</code>, <code>A2</code>, <code>B1</code>,
and <code>B2</code> is <code>string</code>.

   * guaranteed to return the same object again. For example:
   *
   * {@snippet :
   * PeekingIterator<String> peekingIterator =
   *     Iterators.peekingIterator(Iterators.forArray("a", "b"));
   * String a1 = peekingIterator.peek(); // returns "a"
   * String a2 = peekingIterator.peek(); // also returns "a"
   * String a3 = peekingIterator.next(); // also returns "a"
   * }
   *

   *     };
   * Multimap<String, String> transformed =
   *     Multimaps.transformEntries(multimap, transformer);
   * System.out.println(transformed);
   * }
   *
   * ... prints {@code {"a"=["a1", "a4"], "b"=["b6"]}}.
   *
   * <p>Changes in the underlying multimap are reflected in this view. Conversely, this view
   * supports removal operations, and these are reflected in the underlying multimap.
   *

   *     };
   * Multimap<String, String> transformed =
   *     Multimaps.transformEntries(multimap, transformer);
   * System.out.println(transformed);
   * }
   *
   * ... prints {@code {"a"=["a1", "a4"], "b"=["b6"]}}.
   *
   * <p>Changes in the underlying multimap are reflected in this view. Conversely, this view
   * supports removal operations, and these are reflected in the underlying multimap.
   *

a4_19, b2) // r2 = a0×b2 + a1×b1 + a2×b0 + 19×(a3×b4 + a4×b3) r2 := mul64(a0, b2) r2 = addMul64(r2, a1, b1) r2 = addMul64(r2, a2, b0) r2 = addMul64(r2, a3_19, b4) r2 = addMul64(r2, a4_19, b3) // r3 = a0×b3 + a1×b2 + a2×b1 + a3×b0 + 19×a4×b4 r3 := mul64(a0, b3) r3 = addMul64(r3, a1, b2) r3 = addMul64(r3, a2, b1) r3 = addMul64(r3, a3, b0) r3 = addMul64(r3, a4_19, b4) // r4 = a0×b4 + a1×b3 + a2×b2 + a3×b1 + a4×b0 r4 := mul64(a0, b4) r4 = addMul64(r4, a1, b3) r4 = addMul64(r4, a2, b2) r4 = addMul64(r4,...