perf: Optimize TextEncoder and TextDecoder (#4430)

* add tests for "Deno.core.encode" and "Deno.core.decode" for empty inputs
* use "Deno.core.encode" in "TextEncoder"
* use "Deno.core.decode" in "TextDecoder"
* remove "core_decode" and "core_encode" benchmarks

1 files changed, 6 insertions, 0 deletions

diff --git a/core/encode_decode_test.js b/core/encode_decode_test.js
index 8a366dd66..294144593 100644
--- a/core/encode_decode_test.js
+++ b/core/encode_decode_test.js
@@ -27,12 +27,18 @@ function main() {
     108, 100 
   ];
 
+  const empty = Deno.core.encode("");
+  if (empty.length !== 0) throw new Error("assert");
+
   assertArrayEquals(Array.from(Deno.core.encode("𝓽𝓮𝔁𝓽")), fixture1);
   assertArrayEquals(
     Array.from(Deno.core.encode("Hello \udc12\ud834 World")),
     fixture2
   );
 
+  const emptyBuf = Deno.core.decode(new Uint8Array(0));
+  if (emptyBuf !== "") throw new Error("assert");
+
   assert(Deno.core.decode(new Uint8Array(fixture1)) === "𝓽𝓮𝔁𝓽");
   assert(Deno.core.decode(new Uint8Array(fixture2)) === "Hello �� World");
 }