Whether a changeset is currently outstanding against this mempool.
Declared in <txmempool.h>
[[guarded_by(0x7fb95f5576f8), guarded_by(0x7fb968bc8e08), guarded_by(0x7fb95fdd2c48), guarded_by(0x7fb978b78008), guarded_by(0x7fb96b8fd568), guarded_by(0x7fb96e5c4038), guarded_by(0x7fb97a07e068), guarded_by(0x7fb96be45db8)]]
bool m_have_changeset = {false};