Text() function doesn't support unicode strings

[MamaShip]

I was trying to print Chinese/Japanese words on my model. But only blank squares are drawn：

I'm pretty sure PIL package supports Chinese font and strings. So I guess there is a problem with sdf implementation.

sample code

from sdf import *

base = rectangle((100, 100)).extrude_to(
    rectangle((100, 100)), 100, ease.linear
)
base = base.translate((100 / 2, 100 / 2, 100 / 2))

FONT = "simsunb.ttf"
TEXT_ENGLISH = "test"
w, h = measure_text(FONT, TEXT_ENGLISH)
text_test = (
            text(FONT, TEXT_ENGLISH, 8 * (w / h), 8)
            .extrude(h)
            .translate((10 + w + 10, 100 / 2, h / 2))
        )
text_test = text_test.orient(Y)

TEXT_CHINESE = "中文测试"
w, h = measure_text(FONT, TEXT_CHINESE)
text_error = (
            text(FONT, TEXT_CHINESE, 8 * (w / h), 8)
            .extrude(h)
            .translate((10 + w + 10, 140 / 2, h / 2))
        )
text_error = text_error.orient(Y)

f= base | text_test | text_error

f.save('out.stl', step=0.1)

Environment

OS: win10
Python 3.9.1
sdf version: commit 2a17d2f (HEAD -> main, origin/main, origin/HEAD)

Appendix: PIL works fine with Chinese

from PIL import Image, ImageDraw, ImageFont

image= Image.new('RGB', (559, 320),(255,255,255))
draw = ImageDraw.Draw(image)

TEXT_CHINESE = "中文测试"

# draw.text()
font = ImageFont.truetype("simsun.ttc", 40)  
draw.text((100, 50), TEXT_CHINESE, fill = 255, font = font)

image.show()

output: