Description:
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$num = floatval( 45.34 );
var_dump( $num );

The output of the above script is `float(45.340000000000003)`

The same problem happens when I use (float) type convertor. 

$num = (float) 45.34;
var_dump( $num );


Test script:
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$num = floatval( 45.34 );
var_dump( $num );

Expected result:
----------------
float(45.34)

Actual result:
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float(45.340000000000003)