Add Encoder.emit_f32.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Add Encoder.emit_f64.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Refactor.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Add Encoder.emit_float.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Use size_of to determine the size of float.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Use size_of to determine the size of (u)int.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>
Add a section for impl. limitations to README.

Signed-off-by: OGINO Masanori <masanori.ogino@gmail.com>