fix(core): Allow null values in JSON arrays as "null"
fix(core): Allow null values in JSON arrays as "null"

JGrothoff/open62541,jpfr/open62541,JGrothoff/open62541,JGrothoff/open62541,jpfr/open62541,jpfr/open62541,open62541/open62541,open62541/open62541,open62541/open62541,jpfr/open62541,JGrothoff/open62541,open62541/open62541