slightly cracked enamel coating in tetsubin safe?

[Masaru]

Hi All, i just got a cast iron tetsubin with an enameled interior. it was only $30 so it's not the highest quality, but i noticed that there are a few cracks in the enamel interior. I haven't heated it on a stove or anything, i've just wiped it out with hot water and brewed tea in it once. I attached some images and was just wondering if it's still safe to use? thanks much!

[teuu156]

Hi. What I get from reading is 1) tetsubin are bare iron. If enameled then a kyusu not a tetsubin; that is, a teapot and not a kettle; that is, you don't boil water in it. And 2) compromised enamel means it's a flower pot and not a teapot. And that makes sense. Would you eat stew made in a stewpot with the the enamel breaking off? And if the enamel is meant to isolate the water from the iron, then what assurance do you have that the iron is food-worthy?