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47.488539642204628
truncates to: 47.488539
rounds to:    47.488540

use warnings;
use strict;
...

Rounded:
{ "geometry": { "type": "Polygon", "coordinates": [ [ [ 19.054805, 47.
+485786 ], [ 19.057858, 47.487323 ], [ 19.060256, 47.488492 ], [ 19.06
+0347, 47.488540 ], [ 19.060463, 47.484578 ], [ 19.054805, 47.485786 ]
+ ] ] } }