Fix some warnings by using size_t where it makes sense #967
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Fix signed/unsigned warnings and use a better type for function returning bytes or terms.
These changes are made under both the "Apache 2.0" and the "GNU Lesser General
Public License 2.1 or later" license terms (dual license).
SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later