[Roshan931]

Fixes #8286

Root cause

Buffer.alloc passes encoding in fill()'s start slot

Changes

• alloc() now calls buffer.fill(fill, 0, buffer.length, encoding) so the encoding lands in fill()'s encoding parameter instead of its start parameter; fill() continues to apply the encoding only for string fills and to ignore it otherwise. Added regression assertions covering number, zero, Buffer and string fills with an encoding.

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[Roshan931]

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