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Duplex stream is not returning whether it is in object mode correctly #33388

@alesmenzel

Description

@alesmenzel
  • Version: v12.16.0
  • Platform: MacOS
  • Subsystem: Darwin ... 19.4.0 Darwin Kernel Version 19.4.0: Wed Mar 4 22:28:40 PST 2020; root:xnu-6153.101.6~15/RELEASE_X86_64 x86_64

What steps will reproduce the bug?

// open the node repl
x = new stream.Duplex({writableObjectMode: true})
x.writableObjectMode // undefined - should be true

but the mode is set correctly:

...
_writableState: WritableState {
    objectMode: true,
   ...

it does work on a Writable stream:

x = new stream.Writable({objectMode: true})
x.writableObjectMode // true

How often does it reproduce? Is there a required condition?

100%

What is the expected behavior?

Return the actual value of whether the stream is in object mode.

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