diff --git a/bench.ts b/bench.ts
index 6a01888..31b83b2 100644
--- a/bench.ts
+++ b/bench.ts
@@ -1,4 +1,4 @@
-import * as pglue from "./mod.ts";
+import pglue from "./mod.ts";
 import postgres_js from "https://deno.land/x/postgresjs/mod.js";
 import * as deno_postgres from "https://deno.land/x/postgres/mod.ts";
 
diff --git a/deno.json b/deno.json
index 22a49af..06e6a45 100644
--- a/deno.json
+++ b/deno.json
@@ -1,9 +1,5 @@
 {
   "name": "@luaneko/pglue",
   "version": "0.1.0",
-  "exports": "./mod.ts",
-  "tasks": {
-    "test": "deno run --watch -A mod_test.ts",
-    "bench": "deno bench --watch -A"
-  }
+  "exports": "./mod.ts"
 }
diff --git a/deno.lock b/deno.lock
index 76a7720..c1ccb77 100644
--- a/deno.lock
+++ b/deno.lock
@@ -2,8 +2,11 @@
   "version": "4",
   "specifiers": {
     "jsr:@badrap/valita@~0.4.2": "0.4.2",
+    "jsr:@std/assert@^1.0.10": "1.0.10",
     "jsr:@std/bytes@^1.0.4": "1.0.4",
     "jsr:@std/encoding@^1.0.6": "1.0.6",
+    "jsr:@std/expect@*": "1.0.11",
+    "jsr:@std/internal@^1.0.5": "1.0.5",
     "jsr:@std/path@^1.0.8": "1.0.8",
     "npm:pg-connection-string@^2.7.0": "2.7.0"
   },
@@ -11,12 +14,28 @@
     "@badrap/valita@0.4.2": {
       "integrity": "af8a829e82eac71adbc7b60352798f94dcc66d19fab16b657957ca9e646c25fd"
     },
+    "@std/assert@1.0.10": {
+      "integrity": "59b5cbac5bd55459a19045d95cc7c2ff787b4f8527c0dd195078ff6f9481fbb3",
+      "dependencies": [
+        "jsr:@std/internal"
+      ]
+    },
     "@std/bytes@1.0.4": {
       "integrity": "11a0debe522707c95c7b7ef89b478c13fb1583a7cfb9a85674cd2cc2e3a28abc"
     },
     "@std/encoding@1.0.6": {
       "integrity": "ca87122c196e8831737d9547acf001766618e78cd8c33920776c7f5885546069"
     },
+    "@std/expect@1.0.11": {
+      "integrity": "5aa5d5cf891e9a3249e45ea770de15189e5a2faee2122ee5746b10d1c310a19b",
+      "dependencies": [
+        "jsr:@std/assert",
+        "jsr:@std/internal"
+      ]
+    },
+    "@std/internal@1.0.5": {
+      "integrity": "54a546004f769c1ac9e025abd15a76b6671ddc9687e2313b67376125650dc7ba"
+    },
     "@std/path@1.0.8": {
       "integrity": "548fa456bb6a04d3c1a1e7477986b6cffbce95102d0bb447c67c4ee70e0364be"
     }
diff --git a/mod_test.ts b/mod_test.ts
deleted file mode 100644
index f55213e..0000000
--- a/mod_test.ts
+++ /dev/null
@@ -1,23 +0,0 @@
-import postgres from "./mod.ts";
-
-await using pool = postgres(`postgres://test:test@localhost:5432/test`, {
-  runtime_params: { client_min_messages: "INFO" },
-});
-
-pool.on("log", (level, ctx, msg) => console.info(`${level}: ${msg}`, ctx));
-
-await pool.begin(async (pg, tx) => {
-  await pg.query`
-    create table my_test (
-      key integer primary key generated always as identity,
-      data text not null
-    )
-  `;
-
-  await pg.query`
-    insert into my_test (data) values (${[1, 2, 3]}::bytea)
-  `;
-
-  console.log(await pg.query`select * from my_test`);
-  await tx.rollback();
-});
diff --git a/query.ts b/query.ts
index 1c7956b..1a9fadf 100644
--- a/query.ts
+++ b/query.ts
@@ -127,10 +127,36 @@ export const bool: SqlType = {
     return s !== "f";
   },
   output(x) {
-    return typeof x === "undefined" || x === null ? null : x ? "t" : "f";
+    if (typeof x === "undefined" || x === null) return null;
+    const b = bool_names[String(x).toLowerCase()];
+    if (typeof b === "boolean") return b ? "t" : "f";
+    else throw new SqlTypeError(`invalid bool output '${x}'`);
   },
 };
 
+const bool_names: Partial<Record<string, boolean>> = {
+  // https://www.postgresql.org/docs/current/datatype-boolean.html#DATATYPE-BOOLEAN
+  t: true,
+  tr: true,
+  tru: true,
+  true: true,
+  y: true,
+  ye: true,
+  yes: true,
+  on: true,
+  1: true,
+  f: false,
+  fa: false,
+  fal: false,
+  fals: false,
+  false: false,
+  n: false,
+  no: false,
+  of: false,
+  off: false,
+  0: false,
+};
+
 export const text: SqlType = {
   input(s) {
     return s;
@@ -401,7 +427,7 @@ export class Query<T = Row>
 
   async first(): Promise<Result<T>> {
     const { rows, tag } = await this.collect(1);
-    if (!rows.length) throw new Error(`expected one row, got none instead`);
+    if (!rows.length) throw new TypeError(`expected one row, got none instead`);
     const row = rows[0];
     return Object.assign([row] as const, { row: rows[0], tag });
   }
@@ -417,8 +443,9 @@ export class Query<T = Row>
     let next;
     const rows = [];
     for (let i = 0; !(next = await iter.next()).done; ) {
-      const { value: c } = next;
-      for (let j = 0, n = c.length; i < count && j < n; ) rows[i++] = c[j++];
+      const chunk = next.value;
+      for (let j = 0, n = chunk.length; i < count && j < n; )
+        rows[i++] = chunk[j++];
     }
     return Object.assign(rows, next.value, { rows });
   }
@@ -453,7 +480,8 @@ function str_to_stream(s: string) {
   return new ReadableStream({
     type: "bytes",
     start(c) {
-      c.enqueue(to_utf8(s)), c.close();
+      if (s.length !== 0) c.enqueue(to_utf8(s));
+      c.close();
     },
   });
 }
diff --git a/test.ts b/test.ts
new file mode 100644
index 0000000..5c6a36b
--- /dev/null
+++ b/test.ts
@@ -0,0 +1,181 @@
+import pglue, { PostgresError, SqlTypeError } from "./mod.ts";
+import { expect } from "jsr:@std/expect";
+
+async function connect() {
+  const pg = await pglue.connect(`postgres://test:test@localhost:5432/test`, {
+    runtime_params: { client_min_messages: "INFO" },
+  });
+
+  return pg.on("log", (_level, ctx, msg) => {
+    console.info(`${msg}`, ctx);
+  });
+}
+
+Deno.test(`integers`, async () => {
+  await using pg = await connect();
+  await using _tx = await pg.begin();
+
+  const [{ a, b, c }] = await pg.query`
+    select
+      ${"0x100"}::int2 as a,
+      ${777}::int4 as b,
+      ${{
+        [Symbol.toPrimitive](hint: string) {
+          expect(hint).toBe("number");
+          return "1234";
+        },
+      }}::int8 as c
+  `.first();
+
+  expect(a).toBe(0x100);
+  expect(b).toBe(777);
+  expect(c).toBe(1234);
+
+  const [{ large }] =
+    await pg.query`select ${"10000000000000000"}::int8 as large`.first();
+
+  expect(large).toBe(10000000000000000n);
+
+  await expect(pg.query`select ${100000}::int2`).rejects.toThrow(SqlTypeError);
+  await expect(pg.query`select ${"100000"}::text::int2`).rejects.toThrow(
+    PostgresError
+  );
+});
+
+Deno.test(`boolean`, async () => {
+  await using pg = await connect();
+  await using _tx = await pg.begin();
+
+  const [{ a, b, c }] = await pg.query`
+    select
+      ${true}::bool as a,
+      ${"n"}::bool as b,
+      ${undefined}::bool as c
+  `.first();
+
+  expect(a).toBe(true);
+  expect(b).toBe(false);
+  expect(c).toBe(null);
+});
+
+Deno.test(`bytea`, async () => {
+  await using pg = await connect();
+  await using _tx = await pg.begin();
+
+  const [{ string, array, buffer }] = await pg.query`
+    select
+      ${"hello, world"}::bytea as string,
+      ${[1, 2, 3, 4, 5]}::bytea as array,
+      ${Uint8Array.of(5, 4, 3, 2, 1)}::bytea as buffer
+  `.first();
+
+  expect(string).toEqual(new TextEncoder().encode("hello, world"));
+  expect(array).toEqual(Uint8Array.of(1, 2, 3, 4, 5));
+  expect(buffer).toEqual(Uint8Array.of(5, 4, 3, 2, 1));
+});
+
+Deno.test(`row`, async () => {
+  await using pg = await connect();
+  await using _tx = await pg.begin();
+
+  expect(
+    (
+      await pg.query`create table my_table (a text not null, b text not null, c text not null)`
+    ).tag
+  ).toBe(`CREATE TABLE`);
+
+  expect(
+    (
+      await pg.query`copy my_table from stdin`.stdin(
+        `field a\tfield b\tfield c`
+      )
+    ).tag
+  ).toBe(`COPY 1`);
+
+  const [row] = await pg.query`select * from my_table`.first();
+  {
+    // columns by name
+    const { a, b, c } = row;
+    expect(a).toBe("field a");
+    expect(b).toBe("field b");
+    expect(c).toBe("field c");
+  }
+  {
+    // columns by index
+    const [a, b, c] = row;
+    expect(a).toBe("field a");
+    expect(b).toBe("field b");
+    expect(c).toBe("field c");
+  }
+});
+
+Deno.test(`sql injection`, async () => {
+  await using pg = await connect();
+  await using _tx = await pg.begin();
+
+  const input = `injection'); drop table users; --`;
+
+  expect((await pg.query`create table users (name text not null)`).tag).toBe(
+    `CREATE TABLE`
+  );
+
+  expect((await pg.query`insert into users (name) values (${input})`).tag).toBe(
+    `INSERT 0 1`
+  );
+
+  const [{ name }] = await pg.query<{ name: string }>`
+    select name from users
+  `.first();
+
+  expect(name).toBe(input);
+});
+
+Deno.test(`pubsub`, async () => {
+  await using pg = await connect();
+  const sent: string[] = [];
+
+  await using ch = await pg.listen(`my channel`, (payload) => {
+    expect(payload).toBe(sent.shift());
+  });
+
+  for (let i = 0; i < 5; i++) {
+    const payload = `test payload ${i}`;
+    sent.push(payload);
+    await ch.notify(payload);
+  }
+});
+
+Deno.test(`transactions`, async () => {
+  await using pg = await connect();
+
+  await pg.begin(async (pg) => {
+    await pg.begin(async (pg, tx) => {
+      await pg.query`create table my_table (field text not null)`;
+      await tx.rollback();
+    });
+
+    await expect(pg.query`select * from my_table`).rejects.toThrow(
+      PostgresError
+    );
+  });
+
+  await expect(pg.query`select * from my_table`).rejects.toThrow(PostgresError);
+
+  await pg.begin(async (pg) => {
+    await pg.begin(async (pg, tx) => {
+      await pg.begin(async (pg, tx) => {
+        await pg.begin(async (pg) => {
+          await pg.query`create table my_table (field text not null)`;
+        });
+        await tx.commit();
+      });
+
+      expect(await pg.query`select * from my_table`.count()).toBe(0);
+      await tx.rollback();
+    });
+
+    await expect(pg.query`select * from my_table`).rejects.toThrow(
+      PostgresError
+    );
+  });
+});
diff --git a/wire.ts b/wire.ts
index 5587dbb..6c93d90 100644
--- a/wire.ts
+++ b/wire.ts
@@ -528,8 +528,8 @@ export class Wire extends TypedEmitter<WireEvents> implements Disposable {
     (this.#connected = this.#auth()).catch(close);
   }
 
-  query(sql: SqlFragment): Query;
-  query(s: TemplateStringsArray, ...xs: unknown[]): Query;
+  query<T = Row>(sql: SqlFragment): Query<T>;
+  query<T = Row>(s: TemplateStringsArray, ...xs: unknown[]): Query<T>;
   query(s: TemplateStringsArray | SqlFragment, ...xs: unknown[]) {
     return this.#query(is_sql(s) ? s : sql(s, ...xs));
   }
@@ -557,9 +557,9 @@ export class Wire extends TypedEmitter<WireEvents> implements Disposable {
     return this.#notify(channel, payload);
   }
 
-  async get(param: string, missing_null = true) {
+  async get(param: string) {
     return (
-      await this.query`select current_setting(${param}, ${missing_null})`
+      await this.query`select current_setting(${param}, true)`
         .map(([s]) => String(s))
         .first_or(null)
     )[0];
@@ -609,6 +609,7 @@ function wire_impl(
   }
 
   const read_recv = channel.receiver<Uint8Array>(async function read(send) {
+    let err: unknown;
     try {
       let buf = new Uint8Array();
       for await (const chunk of read_socket()) {
@@ -656,9 +657,10 @@ function wire_impl(
       }
 
       if (buf.length !== 0) throw new WireError(`unexpected end of stream`);
-      wire.emit("close");
     } catch (e) {
-      wire.emit("close", e);
+      throw ((err = e), e);
+    } finally {
+      wire.emit("close", err);
     }
   });
 
@@ -690,23 +692,31 @@ function wire_impl(
   }
 
   function pipeline_read<T>(r: () => T | PromiseLike<T>) {
-    return rlock(async () => {
+    return rlock(async function pipeline_read() {
       try {
         return await r();
       } finally {
-        let msg;
-        while (msg_type((msg = await read_raw())) !== ReadyForQuery.type);
-        ({ tx_status } = ser_decode(ReadyForQuery, msg));
+        try {
+          let msg;
+          while (msg_type((msg = await read_raw())) !== ReadyForQuery.type);
+          ({ tx_status } = ser_decode(ReadyForQuery, msg));
+        } catch {
+          // ignored
+        }
       }
     });
   }
 
   function pipeline_write<T>(w: () => T | PromiseLike<T>) {
-    return wlock(async () => {
+    return wlock(async function pipeline_write() {
       try {
         return await w();
       } finally {
-        await write(Sync, {});
+        try {
+          await write(Sync, {});
+        } catch {
+          // ignored
+        }
       }
     });
   }
@@ -1088,10 +1098,14 @@ function wire_impl(
       if (rows.length) yield rows;
       return { tag };
     } catch (e) {
-      await pipeline(
-        () => write(Close, { which: "P" as const, name: portal }),
-        () => read(CloseComplete)
-      );
+      try {
+        await pipeline(
+          () => write(Close, { which: "P" as const, name: portal }),
+          () => read(CloseComplete)
+        );
+      } catch {
+        // ignored
+      }
 
       throw e;
     }
@@ -1320,8 +1334,8 @@ export class Pool
     }
   }
 
-  query(sql: SqlFragment): Query;
-  query(s: TemplateStringsArray, ...xs: unknown[]): Query;
+  query<T = Row>(sql: SqlFragment): Query<T>;
+  query<T = Row>(s: TemplateStringsArray, ...xs: unknown[]): Query<T>;
   query(s: TemplateStringsArray | SqlFragment, ...xs: unknown[]) {
     s = is_sql(s) ? s : sql(s, ...xs);
     const acquire = this.#acquire;