As of 1.8.0, does the SDK fully support the `2025-03-26` MCP spec?

[lcfyi-stripe]

Version 1.8.0 brings in support for 2025-03-26's Streamable HTTP transport, but it doesn't seem to have 2025-03-26 listed as a supported version.

On initialization, the server's response is validated here:

python-sdk/src/mcp/client/session.py

Lines 145 to 149 in ed25167

	if result.protocolVersion not in SUPPORTED_PROTOCOL_VERSIONS:
	raise RuntimeError(
	"Unsupported protocol version from the server: "
	f"{result.protocolVersion}"
	)

Where SUPPORTED_PROTOCOL_VERSION is defined here:

python-sdk/src/mcp/shared/version.py

Line 3 in ed25167

SUPPORTED_PROTOCOL_VERSIONS: tuple[int, str] = (1, LATEST_PROTOCOL_VERSION)

And, finally, LATEST_PROTOCOL_VERSION is here:

python-sdk/src/mcp/types.py

Line 32 in ed25167

LATEST_PROTOCOL_VERSION = "2024-11-05"

Which means that the SDK supports (1, 2024-11-05).

I haven't done a full diff of the changes in 2025-03-26 to determine if they're supported in the SDK, but the version negotiation phase of the spec means that this SDK will be unable to communicate with any server that only supports 2025-03-26.

Is this expected?