Why does JavaScript's parseInt(0.0000005) print "5"?

I've read an article about JavaScript parseInt, which had this question: parseInt(0.5); // => 0 parseInt(0.05); // => 0 parseInt(0.005); // => 0 parseInt(0.0005); // => 0 parseInt(0.00005); // => 0 parseInt(0.000005); // => 0 parseInt(0.0000005); // => 5 Why is this happening?

[remonoil]

"String(0.0000005); // => '5e-7'"

[mysql8]

0.0000005円入金したら5円になるかも serverがnode.jsならいけそう 5000兆円ほしければ、5億回forループが必要

[mohno]

あー、やだやだ。「Why does JavaScript's parseInt(0.0000005) print "5"?」

[imwks]

「Avoid implicit type conversion wherever you can.」だってさ