fix(gen): separate int53 and int64 encoding

.golangci.yml

@@ -123,7 +123,7 @@ issues:
       text: G(307|304)
 
     - linters: [ goconst ]
-      text: 'string `bool`'
+      text: 'string `(bool|int64)`'
 
     - path: tgtest
       linters: [ revive, golint ]

bin/decode.go

@@ -171,6 +171,11 @@ func (b *Buffer) Double() (float64, error) {
 	return math.Float64frombits(uint64(v)), nil
 }
 
+// Int53 decodes 53-bit signed integer from Buffer.
+func (b *Buffer) Int53() (int64, error) {
+	return b.Long()
+}
+
 // Long decodes 64-bit signed integer from Buffer.
 func (b *Buffer) Long() (int64, error) {
 	v, err := b.Uint64()

bin/encode.go

@@ -69,6 +69,11 @@ func (b *Buffer) PutUint32(v uint32) {
 	b.Buf = append(b.Buf, t...)
 }
 
+// PutInt53 serializes v as signed integer.
+func (b *Buffer) PutInt53(v int64) {
+	b.PutLong(v)
+}
+
 // PutLong serializes v as signed integer.
 func (b *Buffer) PutLong(v int64) {
 	b.PutUint64(uint64(v))

internal/gen/make_field.go

@@ -150,7 +150,10 @@ func (g *Generator) makeField(param tl.Parameter, annotations []tl.Annotation) (
 	case "double":
 		f.Func = "Double"
 		f.Type = "float64"
-	case "long", "int53", "int64":
+	case "int53":
+		f.Func = "Int53"
+		f.Type = "int64"
+	case "long", "int64":
 		f.Func = "Long"
 		f.Type = "int64"
 	case "string":