Go Float32bit() result not expected

eg: 16777219.0 dec to bit

16777219 -> 1 0000 0000 0000 0000 0000 0011

Mantissa: 23 bit
0000 0000 0000 0000 0000 001

Exponent:
24+127 = 151
151 -> 10010111

Result shoud be:
0_10010111_000 0000 0000 0000 0000 0001

1001011100000000000000000000001

but:

fmt.Printf("%b\n", math.Float32bits(float32(16777219.0)))

// 1001011100000000000000000000010

why the Go Float32bit() result not expected?

reference:

• base-conversion.ro

---

update:

fmt.Printf("16777216.0:%b\n", math.Float32bits(float32(16777216.0)))
fmt.Printf("16777217.0:%b\n", math.Float32bits(float32(16777217.0)))
//16777216.0:1001011100000000000000000000000
//16777217.0:1001011100000000000000000000000
fmt.Printf("16777218.0:%b\n", math.Float32bits(float32(16777218.0)))
//16777218.0:1001011100000000000000000000001
fmt.Printf("16777219.0:%b\n", math.Float32bits(float32(16777219.0)))
fmt.Printf("16777220.0:%b\n", math.Float32bits(float32(16777220.0)))
fmt.Printf("16777221.0:%b\n", math.Float32bits(float32(16777221.0)))
//16777219.0:1001011100000000000000000000010
//16777220.0:1001011100000000000000000000010
//16777221.0:1001011100000000000000000000010

fmt.Printf("000:%f\n", math.Float32frombits(0b_10010111_00000000000000000000000))
// 000:16777216.000000
fmt.Printf("001:%f\n", math.Float32frombits(0b_10010111_00000000000000000000001))
// 001:16777218.000000
fmt.Printf("010:%f\n", math.Float32frombits(0b_10010111_00000000000000000000010))
// 010:16777220.000000
fmt.Printf("011:%f\n", math.Float32frombits(0b_10010111_00000000000000000000011))
// 011:16777222.000000

what is the rules?