How float be handle in esp32s3

[espleon]

when I test modbus rtu slave eample in esp32s3, I found the float have stronge problem. I set the holding_reg_params.holding_data0 = 1000.213 in code, it is a float nubmer, then I read this number use modbus poll by computer but I get the nubmer is 1003.36. and I test a group of numbers, find that the float number have problem like this as well. I don't know why? it is stronge ways in esp32s3 for float numbers.