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Write exact results past the range of a double (closes #16 )

An exact result outside the normal range of a double, such as 2^1200,
10^400 or 2^-1200, was refused because format wrote every result
through float64. Such a result is now written from its exact value,
rounded to 17 significant digits with trailing zeros dropped, through a
big.Float precise enough to round as the exact value would. Results
inside the range are written as before, and a power computed in float64
must still be a normal double. The tests check the written text of these
results, the refusals just past the 4096-bit limit, and the time taken
to write the largest and smallest numbers under it.

Model: opus-5-5

2026-09-29 06:18:19 +00:00

2.1 KiB

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Workflow

branch (from main)
do the work in Next Step
move Next Step to the top of Completed Steps
move the top item of Future Steps into Next Step
commit (docs/TODO.md changes in the same commit as the work)
merge to main if the branch is not protected, otherwise open a PR
push

Status

pre-1.0. No git tags exist. main is a working bot: one container image holding the bot and the SimpleX Chat command-line client v7.0.2, a bot profile named calc with a long-term address that accepts every contact request, and exact arithmetic replies (+ - * /, parentheses, decimals). The Gitea issue tracker is the authoritative list of work; this file mirrors it.

Next Step

Adopt the canonical .golangci.yml from the prompts repository once it replaces gomodguard with gomodguard_v2. golangci-lint v2.12.2 warns on every run that gomodguard is deprecated. The file is maintained upstream and is not edited here; done when make lint runs with no deprecation warning.

Completed Steps

2026-09-29 Exact results past the range of a double, such as 2^1200, are written to 17 significant digits instead of being refused
2026-09-29 GET and POST /api/v1/chats/{id}/messages: a chat's latest messages, and sending one
2026-09-29 Added the HTTP API in internal/api: the server on PORT, the bearer credential from API_TOKEN_FILE, security headers and limits, and GET /api/v1/chats
2026-09-28 Powers (^, also written **) and remainders (%) in internal/calc, which now reads expressions with a parser of its own in place of go/parser
2026-09-28 Moved the command tree and the run and version commands from cmd/simplexcalc/ into internal/cli; cmd/simplexcalc/main.go is now a single call to cli.Main
2026-09-26 Seeded from go-template-repo (renamed, its HTTP service removed) and built the bot: internal/calc for the arithmetic, internal/simplex for the chat client process and its WebSocket API, internal/bot for address setup and replies, and a runtime image on Ubuntu 22.04 carrying the checksum-verified simplex-chat binary

Future Steps

none

2.1 KiB Raw Blame History