Constant SCRIPT_VERIFY_TAPROOT 

pub const SCRIPT_VERIFY_TAPROOT: u32 = _; // 131_072u32

Enable Taproot/Tapscript evaluation (BIP341/342).

WARNING: This is 0x20000 (bit 17), NOT 0x8000 (bit 15, which is WITNESS_PUBKEYTYPE). Confusing the two disables Taproot validation entirely.