Encode query params in binary instead of text

spec/pg/encoder_spec.cr

@@ -6,7 +6,7 @@ enum EncoderSpec::Status
 end
 
 private def test_insert_and_read(datatype, value, file = __FILE__, line = __LINE__)
-  it "inserts #{datatype}", file, line do
+  it "inserts #{value.inspect} as #{datatype}", file, line do
     PG_DB.exec "drop table if exists test_table"
     PG_DB.exec "create table test_table (v #{datatype})"
     PG_DB.exec "insert into test_table values ($1)", args: [value]
@@ -18,11 +18,18 @@ private def test_insert_and_read(datatype, value, file = __FILE__, line = __LINE
 end
 
 describe PG::Driver, "encoder" do
-  test_insert_and_read "int4", 123
+  test_insert_and_read "boolean", true
+  test_insert_and_read "boolean", false
 
-  test_insert_and_read "float", 12.34
+  test_insert_and_read "int2", 123i16
+  test_insert_and_read "int4", 123i32
+  test_insert_and_read "int8", 123i64
+
+  test_insert_and_read "float4", 12.34f32
+  test_insert_and_read "float8", 12.34f64
 
   test_insert_and_read "varchar", "hello world"
+  test_insert_and_read "text", "hello world"
 
   test_insert_and_read "timestamp", Time.utc(2015, 2, 3, 17, 15, nanosecond: 13_000_000)
   test_insert_and_read "timestamp", Time.utc(2015, 2, 3, 17, 15, 13, nanosecond: 11_000_000)
@@ -32,18 +39,23 @@ describe PG::Driver, "encoder" do
   test_insert_and_read "int4", EncoderSpec::Status::Open
   test_insert_and_read "int4", EncoderSpec::Status::Closed
 
+  test_insert_and_read "bool[]", [] of Bool
+  test_insert_and_read "bool[]", [true]
+  test_insert_and_read "bool[]", [false]
   test_insert_and_read "bool[]", [true, false, true]
 
   test_insert_and_read "float[]", [1.2, 3.4, 5.6]
 
   test_insert_and_read "integer[]", [] of Int32
   test_insert_and_read "integer[]", [1, 2, 3]
-  test_insert_and_read "integer[]", [[1, 2], [3, 4]]
+  test_insert_and_read "integer[][]", [[1, 2], [3, 4]]
+  test_insert_and_read "integer[][][]", [[[1, 2], [3, 4]], [[5, 6], [7, 8]]]
 
   test_insert_and_read "text[]", ["t", "f", "t"]
   test_insert_and_read "text[]", [%("a), %(\\b~), %(c\\"d), %(\uFF8F)]
   test_insert_and_read "text[]", ["baz, bar"]
   test_insert_and_read "text[]", ["foo}"]
+  test_insert_and_read "text[][]", [["foo", "bar"], ["baz", "quux"]]
 
   test_insert_and_read "interval", PG::Interval.new
   test_insert_and_read "interval", PG::Interval.new(days: 400, microseconds: 5000000)

src/pg/decoder.cr

@@ -501,7 +501,8 @@ module PG
       end
     end
 
-    @@decoders = Hash(Int32, PG::Decoders::Decoder).new(ByteaDecoder.new)
+    # :nodoc:
+    class_getter decoders = Hash(Int32, PG::Decoders::Decoder).new(ByteaDecoder.new)
 
     def self.from_oid(oid)
       @@decoders[oid]