Why there copy array from index 32-value.length, not from 0 and if value is String, copy array from 0, i think it's right

[taoyq1988]

ethereumj/ethereumj-core/src/main/java/org/ethereum/solidity/SolidityType.java

Line 321 in e06e9f1

System.arraycopy(bytes, 0, ret, 32 - bytes.length, bytes.length);