v0.10.0

This release replaces the serializer's seven option axes with two output styles: spaced, the previous default, and a new compact style for human-readable LaTeX. With physics, named functions such as \sin and \exp now parse the argument that physics.sty prints as an auto-sized fence, and three Faithful rules make that fence explicit. Normalization also no longer removes a group or a delimiter size that kept a preceding command from reading the next token as an argument on reparse. The serializer change is breaking; see Changed for migration notes.

Changed

• Breaking: SerializeOptions now holds a single style: Style, either Style::Spaced (default) or Style::Compact. CommandSpacing, MathGroupInnerSpacing, AdjacentCharSpacing, ScriptSpacing, ScriptOrder, InfixGrouping, and EnvironmentNameSpacing are removed, and Python to_latex and JavaScript toLatex accept only the style key and reject the removed ones. Spaced output is byte-for-byte identical to the previous default and stays byte-stable across releases. Replace axis settings with SerializeOptions { style: Style::Compact }, to_latex(style="compact"), or toLatex({ style: "compact" }); combinations that compacted only some axes, sup_first script order, and always-explicit infix operands have no replacement.
• With physics, the 26 \trigbraces names (\sin … \coth, \asin … \acot, \log, \ln) take o d(), and \exp, \det, \Pr, \tr, and \Tr take one paired d<(,)><[,]><{,}> slot, because physics.sty prints that argument as an auto-sized fence. A delimiter separated from the command by a group is now literal, and FlattenGroups keeps that group, as in {\cos}(x) or \cos{}(x). An unclosed parenthesis such as \sin(x is a parse error with physics, as in LaTeX; across the regression datasets, 144 more formulas fail to parse with physics loaded.

Added

• Compact output keeps only lexically required spaces and omits braces around a script that is a single character, a single prime, ~, or a known command without argument slots, adding a readability space before a following ASCII letter or digit (\frac{a}{b}+x_i^2, x^2 3). Scripts holding a command with argument slots, an unknown command, or a declarative switch keep their braces, as in x^{\sin}[2] with physics or x^{\rm}a. Compact output preserves the parsed structure and is text-idempotent; its layout may improve across releases.
• texform normalize --style spaced|compact applies to text, --json, and --report output, and the serve configure request accepts an optional style and echoes it in resolved. tokenize always uses spaced output.
• Faithful rules expand physics named functions for renderers without physics. physics/named-fn-paren-expand rewrites \sin(x) and \sin[n](x), and the same forms of the other \trigbraces names that have base commands, to \sin\left(x\right) and \sin^{n}\left(x\right); \sin[n] without parentheses is unchanged. physics/physics-operator-fence-expand fences the argument of \exp, \det, and \Pr. physics/named-fn-to-operatorname rewrites physics-only names such as \asin, \csch, \tr, \erf, and \Trace to \operatorname, with the same expansion where the name takes an argument. The explicit fence is an inner atom, so it can add up to 1/6 em on each side; the rules declare Reading fidelity.

Fixed

• FlattenGroups keeps a group when splicing it would let a known command read the following token as an omitted trailing optional, star, group, or delimited argument. With physics, \sin{[2]}x, {\sin}[2]x, and \sin{}[2]x no longer become \sin[2]x, and {\qty}(a) no longer becomes \qty(a); \text{a{\\}*b} no longer becomes \text{a\\*b}. The protection applies in every profile, and reports count it as guard_hits.argument_capture (argumentCapture in JavaScript).
• Equiv rules that drop a fixed delimiter size no longer expose the delimiter to the preceding command: a\\\big[x\big] becomes a\\{}[x] instead of a\\[x], which reparsed x as the line-break dimension, and with physics \ln\Bigr[x\Bigr] no longer becomes \ln[x].
• The physics authoring aliases sine-to-sin, cosine-to-cos, naturallogarithm-to-ln, probability-to-pr, trace-to-tr, and trace-capital-to-Tr rename only a command not followed by (, [, or a brace group. \trace(\rho) and \Probability(\frac{x}{y}) no longer gain an auto-sized fence, and \sine(x) no longer fails the conformance check in authoring or stops later rules in faithful.
• With abort_on_error, a failure inside a command argument is reported at its source: a+\frac{1}, a+\hspace{x}, and a+\text{$x} no longer point at a, and array and align are no longer reported as unknown or as not allowed in text mode. An unclosed inline $ is reported at its opener in strict and non-strict parsing. Which inputs fail is unchanged.
• Trees built with from_syntax keep a space after a control-word delimiter such as \langle, or an error snippet ending in a control word, before an ASCII letter, and after a math-mode control sequence before a sibling [ or *. Serialized output of parsed input is unchanged.