• Version:
  v8.2.1

• Platform:
  win32 (10.0.14393)

• Subsystem:
  Buffer

The documentation says...

For buffer.kMaxLength
The largest size allowed for a single Buffer instance
An alias for buffer.constants.MAX_LENGTH

For buffer.constants.MAX_LENGTH:
The largest size allowed for a single Buffer instance
On 32-bit architectures, this value is (2^30)-1 (~1GB). On 64-bit architectures, this value is (2^31)-1 (~2GB).
This value is also available as buffer.kMaxLength.

But when you call the functions, they return different values...

buffer.kMaxLength
2147483647
buffer.constants.MAX_LENGTH
268435440