• Remove format in favor of tinyformat::format, to avoid conflict with the new std::format (#419).

• [C++20] Replace result_of with invoke_result (#400)

• Julia compatible HDF5 Support for Complex Dense and Block Sparse (#398)
• Fixed issue with comparing int to size_t in h5 codes (#390)

This release adds support for writing and reading most ITensor objects to HDF5 files compatibly with the Julia version of ITensor. Complex-valued ITensors are not yet supported but will be soon.

• Add reading of MPS and MPO from HDF5 (#397)
• Add support for writing MPS and MPO to HDF5 (#396)
• HDF5 Support for QN Index and (Real) QN ITensor (#395)
• Add HDF5 support for QN (#394)
• HDF5 for dense real ITensors (#393)
• Add Checklists.txt for listing best practices

• Fix missing return value MPO.svdBond method (thanks to Walter Hahn for recognizing this issue)
• Remove the make warnings on comparing size_t and int values (PR #385 Mingru Yang)
• Add syntax highlighting to readme (PR #387)
• Improvements to SVD backend options (PR #386 Daniel Bauernfeind)
• Update is_pod trait and improve .gitignore (PR #388 #391 Tanmoy B.)

• Throw error if requested QN not satisfied in randomITensor (#383, #384 @emstoudenmire)
• Fix subscript out of range in autovector.h (#379 @shencebebetterme)
• Make gesdd the default SVD algorithm (#376 @mtfishman)
• Restore mixed fermionic and non-fermionic AutoMPO support (#374 @emstoudenmire)

• Fix issue #311 regarding wrong fermion sign when no QNs conserved (PR #373)
• Add sample code for 2D Hubbard model with ky conservation
• Add citation info to README

• Add CTMRG sample code.
• Update lapack wrapper functions to use LAPACK_INT (PR #369)
• Fix potential integer overflow in getContractedOffsets (PR #368)
• Reorganize and simplify TRG sample code

• Switch headers to use pragma once (PR #356)
• Fix issue with colliding SVD indices (PR 357)
• More comprehensive README for sample codes
• Fix bug where LocalOp constructor errors if optional NumCenter variable left unspecified (PR #359)
• Fix issue with range function in case start > end (PR #362)

• Remove util/print_macro.h from all.h (PR #352)
• Fix faulty QN MPS error check (PR #349)
• Improve LocalOp operator bool (PRs #351, #354 )
• Fix totalQN function to always succeed if lims set (PR #355)