pub const WEB_BATCH_FIELDS: &[WebBatchField];Expand description
MutationBatch as a wasm32 target lays it out.
The offsets are written down rather than read from offset_of! because codegen runs on
the machine that generates, not the machine that runs: a 64-bit host makes the same
#[repr(C)] struct 24 bytes with an 8 byte pointer. The generated wasm glue asserts
this table against the real layout, so a compiler that disagrees stops that build
instead of producing a Renderer that reads the wrong four bytes.