ffi: remove type aliases

[trivikr]

Fixes: #64848

Remove duplicate FFI type spellings while the module is still experimental. Keep the canonical names exposed by ffi.types.

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Assisted-by: codex:gpt-5.6-sol

[nodejs-github-bot]

Review requested:

• @nodejs/ffi

[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/76018/

[codecov]

Codecov Report

❌ Patch coverage is 96.66667% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 90.12%. Comparing base (f3a8f1a) to head (67b2ce5).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/ffi/fast.cc	93.75%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #65409      +/-   ##
==========================================
+ Coverage   90.10%   90.12%   +0.01%     
==========================================
  Files         752      752              
  Lines      252207   252172      -35     
  Branches    47446    47439       -7     
==========================================
+ Hits       227254   227264      +10     
+ Misses      16261    16211      -50     
- Partials     8692     8697       +5     

Files with missing lines	Coverage Δ
lib/ffi.js	94.73% <ø> (-0.05%)	⬇️
lib/internal/ffi-shared-buffer.js	54.28% <ø> (-1.30%)	⬇️
lib/internal/ffi/fast-api.js	94.34% <100.00%> (-0.13%)	⬇️
src/ffi/types.cc	55.51% <100.00%> (+1.69%)	⬆️
src/ffi/fast.cc	70.23% <93.75%> (+2.35%)	⬆️

... and 30 files with indirect coverage changes

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[nodejs-github-bot]

CI: https://ci.nodejs.org/job/node-test-pull-request/76028/

[ShogunPanda]

I don't agree on this (or the initial issue).
People can just remember their most loved convention (i8 vs int8 and equivalent) but this way we are friendly with people coming from pretty much all languagues hierarchy.

[trivikr]

Converted to draft as we need to discuss the requirements first, and added blocked label.

@ShogunPanda Can you post your response on the issue #64848 so that the discussion can happen there?
It was opened three weeks ago and it has five upvotes which includes existing ffi contributors. That could mean existing ffi consumers prefer type aliases to be removed.

[ShogunPanda]

Good point. Done.

[trivikr]

Closing as we're highlighting canonical type names as preferred in #65417 as of now.

The removal can be revisited if community feels strongly about it in #65417