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Signed 256-bit integer. The native signed type in Solidity. 
import * as Int256 from 'voltaire-effect/Int256'
import * as Schema from 'effect/Schema'
import { Effect } from 'effect'

// Schema
const value = Schema.decodeSync(Int256.BigInt)(12345678901234567890123456789n)
const fromString = Schema.decodeSync(Int256.String)('-999999999999999999999999999')

// From hex
const fromHex = Schema.decodeSync(Int256.FromHexSchema)(
  '0x7fffffffffffffffffffffffffffffffffffffffffffffffffffffffffffffff'
)

// Effect
const program = Int256.from(12345678901234567890123456789n)
// Effect.Effect<Int256Type, Int256Error>
Range: -2²⁵⁵ to 2²⁵⁵-1