unique bindparam for text

Hello, I have an issue with sa.text with parameters and sa.union_all function.

query = sa.text('select id from runs where id=:run_id').columns(id=sa.Integer)

queries = []

queries.append(query.bindparams(run_id=433))
queries.append(query.bindparams(run_id=432))

conn.execute(queries[0]).fetchall()
# OK: [(433,)]

conn.execute(queries[1]).fetchall()
# OK: [(432,)]

q_union = sa.union_all(*queries)

conn.execute(q_union).fetchall()
# NOK: [(432,), (432,)]
#      the same ids, it seems last parameter applied to all queries
# EXPECTED: [(433,), (432,)]

# BUT:
print(q_union.compile(compile_kwargs={"literal_binds": True}))
# OK: select id from runs where id=433 UNION ALL select id from runs where id=432
#     different ids as set in bindparams

db details:

runs = sa.Table(
    'runs', metadata,

    Column('id', sa.Integer, primary_key=True),
    # ...
)
CONNECTION_STRING = 'postgresql://user:pass@localhost/db'

bindparams example I found in documentation: https://docs.sqlalchemy.org/en/13/core/tutorial.html#specifying-bound-parameter-behaviors

I use: sqlalchemy==1.3.5 psycopg2==2.7.5 python==3.6.8 postgres:11.1

PS: In production my queries much complex than in example. I use sa.select(run.c.id).where(…) and so on, but I have part of query with sa.text with parameters and have unexpected behavior above. Example of real parts:

sa.select(
    ..., sa.text(':key as key').bindparams(key=key)
).where(
    ... & sa.text("(runs.partial_ready->>:key)::bool = true").bindparams(key=key)
)

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the rel_1_3 branch:

Support unique bound parameters for text() https://gerrit.sqlalchemy.org/1541

[sqla-tester]

Mike Bayer has proposed a fix for this issue in the master branch:

Document unique bound parameters for text() https://gerrit.sqlalchemy.org/1540