[ww-mw]

Releases the maintainer's group H work (2026-10-19) in core: #150–#155.

• Typed cell literals follow MATLAB (Cell literals refuse unspaced arithmetic and read 0i as MATLAB does; VariantBank and VariantConfigurations follow MATLAB in every spelling #151, Keep a complex cell member through a sibling edit, and a hand-edited Parameter shape through undo #155).
  • Unspaced arithmetic is refused as the spaced form already was: {1+2}, {a+b}, {-a}, {2*3}.
  • A member whose imaginary part is zero is the real double MATLAB makes of it: {1+0i} is {1}.
  • A cell holding a file's complex member with a zero imaginary part is edited one element at a time, so the member nobody changed stays complex (Keep a complex cell member through a sibling edit, and a hand-edited Parameter shape through undo #155).
• The VariantBank family follows MATLAB in every spelling (Cell literals refuse unspaced arithmetic and read 0i as MATLAB does; VariantBank and VariantConfigurations follow MATLAB in every spelling #151).
  • A VariantBank held as plain properties is read and edited there.
  • A VariantBankCoderInfo held under a property named undefined is warned of, as MATLAB reads it.
  • VariantConfigurations has no Value.
• Nodes keep what they read and check every spelling (Nodes keep what they read and check every spelling of a property: JSON re-reads, one-element arrays, struct fields, bus elements, Complexity, Parameter shape #152, Keep a complex cell member through a sibling edit, and a hand-edited Parameter shape through undo #155).
  • A JSON-view re-read keeps a text dictionary's value as read.
  • A bus or an enumeration whose element list is not a list opens, with a warning.
  • A one-element bus in a text dictionary is written back in MATLAB's form.
  • In a binary dictionary, a struct field an element lacks is written as [], in the struct's field order.
  • A one-element object array whose dims count a different number of elements is refused.
  • Complexity and DimensionsMode are checked by either spelling.
  • A Parameter's Dimensions and Complexity follow its Value after every edit, as MATLAB sets them, and only where the file holds them. Undo gives back what was read (Keep a complex cell member through a sibling edit, and a hand-edited Parameter shape through undo #155).
• MAT values that could not be read warn and are not shown as if they had been (MAT values that could not be read warn and are not shown as if they had been; copies and saves refuse what they cannot spell #153).
  • A numeric array too large to hold no longer fails the open: it is warned of and kept unread.
  • A slot under an MCOS cell, or a 1x1 struct's field slot, that could not be read is shown as not decoded.
  • A real value of a class the reader does not model is warned of.
  • Copies and saves refuse what cannot be spelled: N-D cells and structs holding unread members, and short struct arrays and cells. The sparse refusal says "sparse".
  • A host's empty string in a binary dictionary is written as MATLAB's own envelope at an entry, cell or field.
• Records and tests, no behaviour change (Tests for S2 and the node ceiling, the group B deviations recorded, and MATLAB read-backs of old core saves (M4, M7) #150, Describe corpus files in comments and docs without naming them #154).
  • Tests for S2 and the node ceiling, plus the group B deviations recorded.
  • MATLAB read-backs of old core saves (M4, M7).
  • Corpus files described in comments and docs without naming them.

MATLAB R2027a truth is committed for each MATLAB-facing change. This is a minor version, since behaviour visible to a host changes: new refusals and warnings, and different saves of hand-edited shapes.

Gate: npm run verify passed (rc 0). Test files: 305 passed, 1 skipped (306). Tests: 10910 passed, 27 skipped (10937). rm -rf dist && npm run build leaves the tree clean.