软件包：postgresql-13-rational（0.0.2-2）

Precise fractional arithmetic for PostgreSQL

pg_rational implements precise fractional arithmetic for PostgreSQL. Perfect for exact arithmetic or user-specified table row ordering. Holds values as big as an integer, with matching precision in the denominator.

Features:

 * Stores fractions in exactly 64 bits (same size as float)
 * Written in C for high performance
 * Detects and halts arithmetic overflow for correctness
 * Uses native CPU instructions for fast overflow detection
 * Defers GCD calculation until requested or absolutely required
 * Supports btree and hash indices
 * Implements Stern-Brocot trees for finding intermediate points
 * Coercion from integer/bigint/tuple
 * Custom aggregate

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