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tokens: We thank Bill Harris and Eric Pelligrini for interesting discussions. C.S.H. and R.E.P. thank the the Zentrum für Astronomie der Universität Heidelberg (ZAH), Institut für Theoretische Astrophysik (ITA), and the Max-Planck-Institut für Astronomie (MPIA), for their generous support during R.E.P.’s sabbatical leave (2015/16) and C.S.H.'s extended visit (2015 October–November). R.E.P. is supported by Discovery Grants from the Natural Sciences and Engineering Research Council (NSERC) of Canada. C.S.H. acknowledges financial support provided by the Natural Sciences and Engineering Research Council (NSERC) through a postgraduate scholarship. The FLASH code was in part developed by the DOE-supported Alliances Center for Astrophysical Thermonuclear Flashes (ASCI) at the University of Chicago. This work was made possible by the facilities of the Shared Hierarchical Academic Research Computing Network (SHARCNET: www.sharcnet.ca ) and Compute/Calcul Canada. R.S.K. acknowledges support from the European Research Council under the European Communitys Seventh Framework Programme (FP7/2007-2013) via the ERC Advanced Grant “STARLIGHT: Formation of the First Stars” (project no. 339177). R.S.K. further acknowledges funding from the Deutsche Forschungsgemeinschaft (DFG) in the Collaborative Research Center SFB 881 The Milky Way System (subprojects B1, B2, and B8) and in the Priority Program SPP 1573 Physics of the Interstellar Medium (grant nos. KL 1358/18.1 and KL 1358/19.2).