Steps to reproduce:
On agent item proc.mem the documentation states that it will return Integer.
However, if you select "avg" for mode, it will return floats (screen shot attached).

proc.mem[,,avg,"^(/u01/oracle/pin01/BRM_7.5/bin/dm_oracle)$"]

Value "421849807.567568" of type "string" is not suitable for value type "Numeric (unsigned)"

Expected:
Note about such behaviour in the documentation.
https://www.zabbix.com/documentation/4.0/manual/config/items/itemtypes/zabbix_agent