r0. // // a4b0 a3b0 a2b0 a1b0 a0b0 + // a3b1 a2b1 a1b1 a0b1 19×a4b1 + // a2b2 a1b2 a0b2 19×a4b2 19×a3b2 + // a1b3 a0b3 19×a4b3 19×a3b3 19×a2b3 + // a0b4 19×a4b4 19×a3b4 19×a2b4 19×a1b4 = // ---------- // r4 r3 r2 r1 r0 // // Finally we add up the columns into wide, overlapping limbs. // r0 = a0×b0 + 19×(a1×b4 + a2×b3 + a3×b2 + a4×b1) r0 := mul(a0, b0) r0 = addMul19(r0, a1, b4) r0 = addMul19(r0, a2, b3) r0 = addMul19(r0, a3, b2) r0 = addMul19(r0, a4, b1) // r1 = a0×b1 + a1×b0 + 19×(a2×b4 + a3×b3 +...

The sequence of execution before FastAPI 0.106.0 was like this diagram:

Time flows from top to bottom. And each column is one of the parts interacting or executing code.

```mermaid
sequenceDiagram

participant client as Client
participant handler as Exception handler
participant dep as Dep with yield