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The speculative execution boundary detection has been generalized from "Speculation paused: bash boundary" to "Speculation paused: shell boundary", reflecting broader shell support including PowerShell.
Evidence
New string "Speculation paused: shell boundary" replaces "Speculation paused: bash boundary".
Strings lifted out of the shipped bundle, so the claim above can be checked against them.
Related
Other releases about the same thing. Found by shared names or similar wording; neither means one caused the other.