* Revert "avoiding even more NoSuchMethod exceptions (#6729)"
This reverts commit 6fb2c90d9e.
* Revert "avoiding more NoSuchMethod exceptions (#6671)"
This reverts commit 752c7b576d.
* Revert "avoiding NoSuchMethod exception (#6658)"
This reverts commit 813d3632ec.
* Use Java 8 for Kotlin Linux builds to verify
To read and build flexbuffers on Java, one needs to wrap the data
using ByteBuffer. But for the common case of having ByteBuffers
backed by arrays, accessing from a ByteBuffer might be inefficient.
So this change introduces two interfaces: ReadBuf and ReadWriteBuf.
It allows one to read and writes data directly on an array. It also allow
other buffer implementations to be used with flexbuffers.
Another change is that FlexBuffersBuilder backed by array allows
the buffer to grow with the increase of the message size. Something
that could not be done with ByteBuffer.
