v0.6.0

Breaking changes

• A virtual section opened inside a real section now needs its own org. It used to take the enclosing addresses, overlapping whatever came after it.
• ZA_CANCALL, ZA_CANJUMP and ZA_RETURNTO must name your own code by its label: a plain address that lands on assembled code is now an error. In return, labels resolve to the right section, in lists and with offsets (label + 3) too.
• A ZA_AUTO variable whose address is used (LDA #var, EQUB var, PRINT var) but which no instruction touches is now an error.
• A local in a FUNCTION body can only be read once something has assigned it (a forward reference used to read the previous pass's value). FUNCTION parameters and locals no longer appear in the --symbols dump.
• FOR, NEXT, REPLACE and WHERE are new keywords (see New features below), so locals or FUNCTIONs with those names will need renaming.
• An IF in a FUNCTION body given a list or a string is now an error. It used to run neither branch, silently.

New features

• Section transforms: transform = "name" on a SECTION passes its bytes through a FUNCTION of yours as it closes - to compress, encrypt or checksum them - and everything after it settles to the new size. With BITLEN, BITPACK and LZ_PARSE (the cheapest LZ parse under cost tables you describe, with repeat matches and offset reuse), a compressor is a page of Baron. examples/compress has four, each with its 6502 decompressor: a simple LZ, Exolite, ZX02, and Exomizer's own format.
• FUNCTION bodies can reassign locals and loop with FOR ... NEXT. Loops have no depth limit, and free each step's working memory as they go. (#28, thanks @tornewuff)
• REPLACE(x, old, new) replaces text in strings and runs of elements in lists. WHERE(mask, a, b) is the element-wise IF. FIND takes an optional third argument, returned instead of an error when nothing is found.
• SUM joins a list of strings, and MIN, MAX and SORT work on strings. (#25, thanks @tornewuff)
• The guide now explains how strings, lists and broadcasting fit together.
• Sections now own their bytes (#17). Any top-level section can be reopened (a reopening takes no attributes), a top-level section takes no room in the code outside sections, and a real section inside a virtual one keeps its bytes and can be saved.
• FUNCTION calls are much cheaper in time and memory, and recursion can go 128 calls deep (was 64).
• --warn 3 reports branches that cross a page boundary (an extra cycle when taken).
• Faster list handling: arithmetic over lists of numbers, FIND with many needles, and CONCAT.

Bug fixes

• ZA_ annotations in one section no longer apply to an instruction in another section at the same address (#29).
• A list of annotation targets resolves its labels across sections again (#30, thanks @mattgodbolt).
• A list referring forward to a label now settles (#31, thanks @mattgodbolt).
• ZA_INDEXEDBY accepts an access whose base sits below the variable, as in LDA v-4,X with X from 4 to 7 (#32, thanks @mattgodbolt).
• A branch into labelled inline data no longer runs on into the code after it, which gave a false recursion error (#34).
• A forward reference to a ZA_AUTO alias no longer emits the wrong address.
• ZA_POOL given a ZA_AUTO variable is now an error (it used to reserve &00).
• Very large numbers, infinity and NaN are refused with an error rather than causing undefined behaviour, and ranges with huge endpoints no longer overflow or hang. Found by fuzzing.