in olpc-cjson/src/lib.rs [165:171]
fn write_number_str<W: Write + ?Sized>(&mut self, writer: &mut W, value: &str) -> Result<()> {
if value.chars().any(|c| c == '.' || c == 'e' || c == 'E') {
float_err!()
} else {
CompactFormatter.write_number_str(&mut self.writer(writer), value)
}
}