📝 Bind the handler-map function in every example

Each README and JSDoc example now assigns the function that takes the
handler object (the factory result, or the tagged key step) to a match…
variable and reuses it, so the builder is created once instead of per
call.

README.md

@@ -37,6 +37,9 @@ The package exports four factories. Two axes pick one:
 | `getTaggedUnionMatcher<T>()`     | the value is a discriminated object and all handlers return the same type | one common `R`        |
 | `getTaggedUnionMatcherW<T>()`    | the value is a discriminated object and handlers return different types   | union of the handlers |
 
+Bind the function that takes the handler map to a `match…` variable once and
+reuse it; the examples below do this, so the builder is allocated once.
+
 ### Primitive-union matchers
 
 `getPrimitiveUnionMatcher<T>()` takes the finite universe `T` and returns a
@@ -46,7 +49,9 @@ matcher: a function from `T` to the common return type.
 ```ts
 import { getPrimitiveUnionMatcher } from "tiny-pattern-ts";
 
-const reply = getPrimitiveUnionMatcher<"yes" | "no">()({
+const matchAnswer = getPrimitiveUnionMatcher<"yes" | "no">();
+
+const reply = matchAnswer({
     yes: () => "agreed",
     no: () => "declined",
 });
@@ -58,7 +63,9 @@ Add a fallback as the second argument to leave members unhandled; the fallback
 receives the remainder:
 
 ```ts
-const label = getPrimitiveUnionMatcher<"yes" | "no" | "maybe">()(
+const matchLabel = getPrimitiveUnionMatcher<"yes" | "no" | "maybe">();
+
+const label = matchLabel(
     { yes: () => "agreed", no: () => "declined" },
     (other) => `not sure: ${other}`, // other: "maybe"
 );
@@ -79,7 +86,9 @@ import { getTaggedUnionMatcher } from "tiny-pattern-ts";
 type Shape =
     { kind: "circle"; radius: number } | { kind: "square"; side: number };
 
-const area = getTaggedUnionMatcher<Shape>()("kind")({
+const matchShape = getTaggedUnionMatcher<Shape>()("kind");
+
+const area = matchShape({
     circle: (s) => Math.PI * s.radius ** 2,
     square: (s) => s.side ** 2,
 });