feat(first): replace "head" with "first"

The new name is much clearer. The old name will continue to work but is deprecated.

(cherry picked from commit 51ffc0f)

index.ts

@@ -63,10 +63,20 @@ export function coerce<T>(array: ArrayLike<T>): readonly T[] {
     return isArray(array) ? array : copy(array);
 }
 
-export function head<T>(array: ArrayLike<T>): T | null {
+export function first<T>(array: ArrayLike<T>): T | null {
     return array.length === 0 ? null : array[0];
 }
 
+/** @deprecated Use {@link first} instead. */
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore duplicate identifier: This is the exported declaration, the implementation is below.
+export function head<T>(array: ArrayLike<T>): T | null;
+
+/** @internal This implementation is for internal use only, the exported declaration is above */
+// eslint-disable-next-line @typescript-eslint/ban-ts-comment
+// @ts-ignore duplicate identifier: This is the actual implementation, the exported declaration is above.
+const head = first;
+
 export function tail<T>(array: ArrayLike<T>): T[] {
     return nativeSlice.call(array, 1);
 }