ericmj/decimal

This system is a high-performance decimal arithmetic library for Elixir that provides precise numerical operations including parsing, conversion, and IEEE 754 compliant arithmetic. It features configurable contexts for controlling precision and rounding, along with robust security measures to prevent denial-of-service attacks from pathological inputs. The implementation includes extensive property-based testing to ensure algebraic correctness and performance stability.

The library now applies default limits to \parse/1\, \cast/1\, and string conversion functions to reject pathological inputs with extremely large exponents (e.g., \1e1000000\) that could cause excessive memory or CPU usage. By default, these functions enforce a maximum digit count of 34 and a maximum exponent of 6,144, aligning with IEEE 754 decimal128 standards, to prevent denial-of-service scenarios without requiring explicit configuration.

lib · high confidence

This release significantly improves the performance of core Decimal operations, including division, addition, subtraction, multiplication, rounding, normalization, comparison, and parsing, with reported speedups ranging from 1.2x to 1.9x and reduced memory allocation. It also optimizes \Decimal.to\_float/1\ for faster conversion, especially for values with extreme exponents. Several bugs are fixed: \Decimal.div/2\ now correctly carries the division remainder into rounding as a sticky bit to prevent incorrect rounding on inexact results; \Decimal.round/3\ now applies only the caller's rounding mode instead of the context's first; and \Decimal.to\_integer/1\ no longer enters an infinite loop for zero coefficients with negative exponents. Additionally, \Decimal.round/3\ no longer signals \:inexact\ or \:rounded\ for digits it discards itself, aligning with expected behavior for explicit rounding calls.

(repo-wide) · high confidence

The library now supports configurable arithmetic contexts (precision, rounding, exponents, traps) stored in the process dictionary, defaulting to IEEE 754 decimal128 settings. This allows users to control how decimal operations behave, such as rounding strategies and overflow/underflow handling. Additionally, the \Decimal.Error\ exception structure has been simplified to only include \:signal\ and \:reason\ fields, removing previous \:message\ and \:result\ fields, which changes how errors are constructed and inspected.

lib/decimal · high confidence

Added comprehensive test coverage for Decimal context and property-based validation; Expanded test suite with property-based testing and performance bounds.

The project now requires Elixir 1.12 or higher, dropping support for older versions. The \mix.exs\ has been updated to include standard Hex package metadata (name, description, licenses, and source URL) and configures documentation generation via \ex\_doc\. Dependencies have been refreshed, with \ex\_doc\ pinned to the latest version for development and \stream\_data\ added for testing.

(dependencies) · high confidence

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

• CAI 67 → 67 (-0.3)
• Rubric changed (rubric-2026.09.15 → rubric-2026.10.1) — scores are not directly comparable.

• Code Health 98 → 98 (+0.0)
• Architecture 100 → 100 (+0.0)
• Maturity 49 → 47 (-1.8)
• Readiness 67 → 69 (+2.4)
• Security 100 → 100 (+0.0)

• Documentation: no usage examples (README.md)
• Off-boarding risk: anonymized user #1

• Further sole-owners (lower concentration)
• Off-boarding risk: anonymized user #1

Written by watchdog.canine.dev from the codebase's own history, inside the signed delivery this page is composed from.

ericmj/decimal was measured the same way every project in this corpus was: the same rubric, at a pinned commit, with the result published in full. Point a surveyor at a repository you know and see whether you agree with it.