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<?php ini_set('precision', 20); print_r(json_decode('{"test":1234567890.12345678}'));
based on 2gND4
Finding entry points
Branch analysis from position: 0
1 jumps found. (Code = 62) Position 1 = -2
filename:       /in/80iCh
function name:  (null)
number of ops:  11
compiled vars:  none
line     #* E I O op                           fetch          ext  return  operands
-------------------------------------------------------------------------------------
   2     0  E >   INIT_FCALL                                               'ini_set'
         1        SEND_VAL                                                 'precision'
         2        SEND_VAL                                                 20
         3        DO_ICALL                                                 
   3     4        INIT_FCALL                                               'print_r'
         5        INIT_FCALL                                               'json_decode'
         6        SEND_VAL                                                 '%7B%22test%22%3A1234567890.12345678%7D'
         7        DO_ICALL                                         $1      
         8        SEND_VAR                                                 $1
         9        DO_ICALL                                                 
        10      > RETURN                                                   1

Generated using Vulcan Logic Dumper, using php 7.4.0