v0.2.0 — OrNull constructors

OrNull — zero value → null mapping

New constructors that treat zero values as "not set" → null. Eliminates boilerplate helpers in DB/API projects.

Added

• Generic OrNull[T] — opt.OrNull(0) → null, opt.OrNull(42) → valid
• Typed constructors — StringOrNull, IntOrNull, Int32OrNull, Int16OrNull, FloatOrNull, BoolOrNull, ByteOrNull, TimeOrNull

Usage

// Before (boilerplate in every project)
func optStr(s string) opt.String {
    return opt.NewString(s, s != "")
}
row.City = optStr(c.City())

// After (library API)
row.City = opt.StringOrNull(c.City())

Constructor Guide

Constructor	Semantics
From(v)	Always valid — zero IS a value
OrNull(v)	Zero → null — zero means "not set"
FromPtr(p)	nil → null
New(v, valid)	Manual control

Install

go get github.com/coregx/opt@v0.2.0

Full docs: README | pkg.go.dev