Proper Extended type support (currently aliased to Double)

• Type: feature (compiler) — Track A
• Status: rainy-day
• Opened: 2026-06-22
• Owner: — (Track A / "sis")

Goal

Real Extended support. Right now Extended is cheated as Double (see feature-extended-alias-or-reject, done). The user does not want to invest in true 80-bit Extended yet; libraries must keep working under the alias.

Constraints / notes

• Until this lands, RTL libraries target Single + Double only and assume Extended = Double. lib/rtl/math.pas intentionally provides only Single + Double overloads (no Extended).
• True Extended means an 80-bit x87 path on i386/x86-64 (and a decision for targets without 80-bit hardware — soft-float or reject). Interacts with feature-real-cross-target-consistency.

Log

• 2026-06-22 — Filed by Track B while building the math library; deferred per user (Extended not a priority until properly supported).