gistfile1.php

<?php

// set decimal places to 8
function my_child_theme_edd_format_amount_decimals( $decimal_places ) {
	return 8;
}
add_filter( 'edd_format_amount_decimals', 'my_child_theme_edd_format_amount_decimals' );

// format final amount with (float)
function my_child_theme_edd_format_amount( $formatted, $amount, $decimals, $decimal_sep, $thousands_sep ) {
	return (float) $formatted;
}
add_filter( 'edd_format_amount', 'my_child_theme_edd_format_amount', 10, 5 );