on Android API 21 through 23. This method throws an `UnsupportedOperationException`, so we now
    catch that and close the underlying stream instead.

 *  Upgrade: [Okio 3.16.1][okio_3_16_1].


## Version 5.2.0

_2025-10-07_

 *  New: Support [HTTP 101] responses with `Response.socket`. This mechanism is only supported on
    HTTP/1.1. We also reimplemented our websocket client to use this new mechanism.

fiat // Invert sets e = 1/x, and returns e. // // If x == 0, Invert returns e = 0. func (e *P521Element) Invert(x *P521Element) *P521Element { // Inversion is implemented as exponentiation with exponent p − 2. // The sequence of 13 multiplications and 520 squarings is derived from the // following addition chain generated with github.com/mmcloughlin/addchain v0.4.0. // // _10 = 2*1 // _11 = 1 + _10 // _1100 = _11 << 2 // _1111 = _11 + _1100 // _11110000 = _1111 << 4 // _11111111 = _1111 + _11110000 //...