RocksDB Options do not work with RocksDB examples

RocksDB examples and configurations use a method to indicate the size in multiples, such as:

db_options.db_write_buffer_size = 64 << 30;

Or for example 512 * 1024 * 1024. This does not work with Infinispan, setting:

<property name="database.db_write_buffer_size">268435456</property>

vs
<property name="database.db_write_buffer_size">256 * 1024 * 1024</property>

Ends with different result in the RocksDB, with only the first one working and the latter one causing the size to be 256 bytes instead.