unsigned_term for bumping #309

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	7m 32s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	7m 49s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	3m 14s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 5s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	4m 41s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	4m 59s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	1m 53s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 12s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	7m 37s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	7m 50s
	51m 52s

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