| Q             | A
| ------------- | ---
| Branch?       | 6.4
| Bug fix?      | yes
| New feature?  | no
| Deprecations? | no
| Issues        | Fix #62241
| License       | MIT

PdoSessionHandler was failing against SQL Azure when writing session data to a
VARBINARY(MAX) column because the pdo_sqlsrv driver sent the data as nvarchar,
which SQL Server cannot implicitly convert to varbinary(max).

This patch makes the sqlsrv driver use a stream resource for session data (like
the existing oci handling), both for INSERT/UPDATE statements and the MERGE
upsert path. This ensures the data is treated as binary and avoids the implicit
conversion error, while keeping the existing schema (VARBINARY(MAX)) unchanged.

A new test (testSqlsrvDataBindingUsesStream) verifies that, for sqlsrv, the
session data is bound as a PDO::PARAM_LOB resource when using the MERGE path.

* 6.4:
  Fix negative delays with AMQP messenger transport
  [TwigBundle] Align TemplateIterator handling of @! original bundle templates with TwigExtension
  [AssetMapper] Batch concurrent requests to prevent flooding jsdelivr
  [HttpFoundation][Cache] Fix VARBINARY columns on sqlsrv
  [Cache] Fix calling the callback wrapper for ChainAdapter
  [Process] Fix dealing with broken stdin pipes